12886731 has 96 divisors (see below), whose sum is σ = 25159680. Its totient is φ = 6220800.

The previous prime is 12886729. The next prime is 12886733. The reversal of 12886731 is 13768821.

12886731 = 94² + 95² + ... + 340².

It is an interprime number because it is at equal distance from previous prime (12886729) and next prime (12886733).

It is not a de Polignac number, because 12886731 - 2¹ = 12886729 is a prime.

It is a super-2 number, since 2×12886731² = 332135671732722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12886733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 415686 + ... + 415716.

It is an arithmetic number, because the mean of its divisors is an integer number (262080).

Almost surely, 2^12886731 is an apocalyptic number.

12886731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12886731 is a deficient number, since it is larger than the sum of its proper divisors (12272949).

12886731 is a wasteful number, since it uses less digits than its factorization.

12886731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 94 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 12886731 is about 3589.8093264128. The cubic root of 12886731 is about 234.4485697575.

The spelling of 12886731 in words is "twelve million, eight hundred eighty-six thousand, seven hundred thirty-one".