2978

2978 is a natural number that follows 2977 and precedes 2979. It is an even, composite number with prime factorization 2 × 1489, where 1489 is prime. Therefore, 2978 is a semiprime (the product of two primes).

The sum of its proper divisors is 1 + 2 + 1489 = 1492, which is less than 2978. Consequently, 2978 is a deficient number, not a perfect or abundant one.

In various bases, 2978 has the representations: binary 101110100010, octal 5642, and hexadecimal BA2. In Roman numerals, 2978 is MMCM LXXVIII, combining the values for 2000 (MM), 900 (CM), 70 (LXX), and 8 (VIII).

A notable number-theoretic property is that 2978 can be expressed as a sum of two squares: 2978 = 53^2 + 13^2. This follows from 1489 being a prime congruent to 1 modulo 4 (1489 = 20^2 + 33^2), since 2978 = 2 × 1489 can be written as (20 + 33)^2 + (20 − 33)^2 = 53^2 + 13^2.

No widely recognized special significance attaches to 2978 beyond its basic arithmetic and representation properties. It serves as a simple example of a semiprime and of numbers expressible as sums of two squares.