12879981 has 12 divisors (see below), whose sum is σ = 18638620. Its totient is φ = 8570880.

The previous prime is 12879947. The next prime is 12879983. The reversal of 12879981 is 18997821.

It can be written as a sum of positive squares in 2 ways, for example, as 1550025 + 11329956 = 1245^2 + 3366^2 .

It is not a de Polignac number, because 12879981 - 2²¹ = 10782829 is a prime.

It is a super-2 number, since 2×12879981² = 331787821120722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12879983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5991 + ... + 7851.

Almost surely, 2^12879981 is an apocalyptic number.

It is an amenable number.

12879981 is a deficient number, since it is larger than the sum of its proper divisors (5758639).

12879981 is a wasteful number, since it uses less digits than its factorization.

12879981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2636 (or 2633 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The square root of 12879981 is about 3588.8690419128. The cubic root of 12879981 is about 234.4076283108.

The spelling of 12879981 in words is "twelve million, eight hundred seventy-nine thousand, nine hundred eighty-one".