12718731 has 4 divisors (see below), whose sum is σ = 16958312. Its totient is φ = 8479152.

The previous prime is 12718721. The next prime is 12718757. The reversal of 12718731 is 13781721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13781721 = 3 ⋅4593907.

It is not a de Polignac number, because 12718731 - 2⁷ = 12718603 is a prime.

It is a super-2 number, since 2×12718731² = 323532236500722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12718721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2119786 + ... + 2119791.

It is an arithmetic number, because the mean of its divisors is an integer number (4239578).

Almost surely, 2^12718731 is an apocalyptic number.

12718731 is a deficient number, since it is larger than the sum of its proper divisors (4239581).

12718731 is an equidigital number, since it uses as much as digits as its factorization.

12718731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4239580.

The product of its digits is 2352, while the sum is 30.

The square root of 12718731 is about 3566.3329906222. The cubic root of 12718731 is about 233.4253009347.

The spelling of 12718731 in words is "twelve million, seven hundred eighteen thousand, seven hundred thirty-one".