12457731 has 32 divisors (see below), whose sum is σ = 19837440. Its totient is φ = 6854400.

The previous prime is 12457729. The next prime is 12457759. The reversal of 12457731 is 13775421.

12457731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12457731 - 2¹ = 12457729 is a prime.

It is a super-2 number, since 2×12457731² = 310390123336722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (12457721) 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, 30255 + ... + 30663.

It is an arithmetic number, because the mean of its divisors is an integer number (619920).

Almost surely, 2^12457731 is an apocalyptic number.

12457731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12457731 is a deficient number, since it is larger than the sum of its proper divisors (7379709).

12457731 is a wasteful number, since it uses less digits than its factorization.

12457731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507.

The product of its digits is 5880, while the sum is 30.

The square root of 12457731 is about 3529.5511046024. The cubic root of 12457731 is about 231.8175525061.

The spelling of 12457731 in words is "twelve million, four hundred fifty-seven thousand, seven hundred thirty-one".