12915856 has 10 divisors (see below), whose sum is σ = 25024502. Its totient is φ = 6457920.

The previous prime is 12915821. The next prime is 12915883. The reversal of 12915856 is 65851921.

It can be written as a sum of positive squares in only one way, i.e., 12250000 + 665856 = 3500^2 + 816^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403605 + ... + 403636.

Almost surely, 2^12915856 is an apocalyptic number.

12915856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12915856 is a deficient number, since it is larger than the sum of its proper divisors (12108646).

12915856 is an equidigital number, since it uses as much as digits as its factorization.

12915856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807249 (or 807243 counting only the distinct ones).

The product of its digits is 21600, while the sum is 37.

The square root of 12915856 is about 3593.8636590722. The cubic root of 12915856 is about 234.6250607769.

The spelling of 12915856 in words is "twelve million, nine hundred fifteen thousand, eight hundred fifty-six".