15556

15556 is a natural number that follows 15555 and precedes 15557. In decimal notation it is composed of the digits 1, 5, 5, 5, and 6. The number is even and composite.

Its prime factorization is 2^2 × 3889, where 3889 is a prime number. Therefore, the positive divisors of 15556 are 1, 2, 4, 3889, 7778, and 15556. It is not a prime, and it is not a perfect square.

Sum of divisors: σ(15556) = 27230, so the sum of proper divisors equals 11674. Because 11674 < 15556, the number is deficient rather than perfect or abundant.

Numeral representations: in hexadecimal, 15556 equals 0x3CC4, and in binary it is 11110011000100.

Beyond its role as a numeric label, 15556 does not appear to have widely recognized mathematical constants or theorems associated with it. It is mainly of interest within basic number theory as an example of a number with a 2^2 times a prime factorization.