12756731 has 4 divisors (see below), whose sum is σ = 13738032. Its totient is φ = 11775432.

The previous prime is 12756727. The next prime is 12756739. The reversal of 12756731 is 13765721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12756731 - 2² = 12756727 is a prime.

It is a super-2 number, since 2×12756731² = 325468371612722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12756739) 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, 490631 + ... + 490656.

It is an arithmetic number, because the mean of its divisors is an integer number (3434508).

Almost surely, 2^12756731 is an apocalyptic number.

12756731 is a deficient number, since it is larger than the sum of its proper divisors (981301).

12756731 is an equidigital number, since it uses as much as digits as its factorization.

12756731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981300.

The product of its digits is 8820, while the sum is 32.

The square root of 12756731 is about 3571.6566184335. The cubic root of 12756731 is about 233.6575395707.

The spelling of 12756731 in words is "twelve million, seven hundred fifty-six thousand, seven hundred thirty-one".