12878731 has 4 divisors (see below), whose sum is σ = 12935200. Its totient is φ = 12822264.

The previous prime is 12878729. The next prime is 12878737. The reversal of 12878731 is 13787821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13787821 = 43 ⋅320647.

It is a cyclic number.

It is not a de Polignac number, because 12878731 - 2¹ = 12878729 is a prime.

It is a super-2 number, since 2×12878731² = 331723424340722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12878737) 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, 27891 + ... + 28348.

It is an arithmetic number, because the mean of its divisors is an integer number (3233800).

Almost surely, 2^12878731 is an apocalyptic number.

12878731 is a deficient number, since it is larger than the sum of its proper divisors (56469).

12878731 is an equidigital number, since it uses as much as digits as its factorization.

12878731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56468.

The product of its digits is 18816, while the sum is 37.

The square root of 12878731 is about 3588.6948881174. The cubic root of 12878731 is about 234.4000449918.

The spelling of 12878731 in words is "twelve million, eight hundred seventy-eight thousand, seven hundred thirty-one".