2397

2397 is a natural number that follows 2396 and precedes 2398. In its prime factorisation it is expressed as 3 × 17 × 47, making it a composite, odd, and square‑free integer. Its sum of divisors is 1 + 3 + 17 + 47 + 51 + 141 + 799 + 2397 = 3456, and its Euler totient value φ(2397) equals 1320.

In astronomy, 2397 is the sequential number of a main‑belt asteroid. Designated 2397 Thompson, it was discovered on 7 October 1978 by Czech astronomer Antonín Mrkos at the Kleť Observatory. The asteroid is classified as an S‑type body, with an approximate diameter of 12 km and an orbital period of about 4.5 years around the Sun.

The number also appears in the Gregorian calendar as the year 2397 CE, a future year often used in speculative fiction and long‑range planning scenarios. No significant historical events are recorded for that year, as it lies far beyond the present historical record.

In mathematics, 2397 is notable for being the product of three distinct primes, a property that gives it a relatively low number of divisors (eight). Its binary representation is 100101011001, and in hexadecimal it is expressed as 0x95B.

Various cultural references to the figure 2397 exist, such as its use in serial numbers, model designations, and as a placeholder in engineering documentation. Although not a widely recognized symbolic number, its occurrence across multiple domains illustrates the routine ways in which specific integers permeate scientific, technical, and fictional contexts.