12857481 has 32 divisors (see below), whose sum is σ = 23448320. Its totient is φ = 6780672.

The previous prime is 12857443. The next prime is 12857489. The reversal of 12857481 is 18475821.

12857481 is a `hidden beast` number, since 1 + 2 + 8 + 574 + 81 = 666.

It is not a de Polignac number, because 12857481 - 2⁹ = 12856969 is a prime.

It is a super-2 number, since 2×12857481² = 330629635330722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12857489) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160 + ... + 5073.

It is an arithmetic number, because the mean of its divisors is an integer number (732760).

Almost surely, 2^12857481 is an apocalyptic number.

It is an amenable number.

12857481 is a deficient number, since it is larger than the sum of its proper divisors (10590839).

12857481 is a wasteful number, since it uses less digits than its factorization.

12857481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5262 (or 5256 counting only the distinct ones).

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

The square root of 12857481 is about 3585.7329794618. The cubic root of 12857481 is about 234.2710534260.

The spelling of 12857481 in words is "twelve million, eight hundred fifty-seven thousand, four hundred eighty-one".