12309731 has 6 divisors (see below), whose sum is σ = 14319540. Its totient is φ = 10551156.

The previous prime is 12309721. The next prime is 12309749. The reversal of 12309731 is 13790321.

It is a de Polignac number, because none of the positive numbers 2^k-12309731 is a prime.

It is a super-2 number, since 2×12309731² = 303058954584722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12309731.

It is not an unprimeable number, because it can be changed into a prime (12309721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 125561 + ... + 125658.

It is an arithmetic number, because the mean of its divisors is an integer number (2386590).

Almost surely, 2^12309731 is an apocalyptic number.

12309731 is a deficient number, since it is larger than the sum of its proper divisors (2009809).

12309731 is an equidigital number, since it uses as much as digits as its factorization.

12309731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251233 (or 251226 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 12309731 is about 3508.5226235554. The cubic root of 12309731 is about 230.8958820651.

The spelling of 12309731 in words is "twelve million, three hundred nine thousand, seven hundred thirty-one".