12457881 has 28 divisors (see below), whose sum is σ = 19516608. Its totient is φ = 7933464.

The previous prime is 12457871. The next prime is 12457897. The reversal of 12457881 is 18875421.

12457881 is a `hidden beast` number, since 1 + 2 + 4 + 578 + 81 = 666.

It is not a de Polignac number, because 12457881 - 2⁶ = 12457817 is a prime.

It is a super-2 number, since 2×12457881² = 310397598020322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12457871) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 16396 + ... + 17138.

Almost surely, 2^12457881 is an apocalyptic number.

It is an amenable number.

12457881 is a deficient number, since it is larger than the sum of its proper divisors (7058727).

12457881 is an frugal number, since it uses more digits than its factorization.

12457881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784 (or 769 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 12457881 is about 3529.5723536995. The cubic root of 12457881 is about 231.8184829188.

The spelling of 12457881 in words is "twelve million, four hundred fifty-seven thousand, eight hundred eighty-one".