12979681 has 16 divisors (see below), whose sum is σ = 15382080. Its totient is φ = 10797120.

The previous prime is 12979651. The next prime is 12979693. The reversal of 12979681 is 18697921.

It is a cyclic number.

It is not a de Polignac number, because 12979681 - 2⁷ = 12979553 is a prime.

It is a super-2 number, since 2×12979681² = 336944237723522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12979601) 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 15 ways as a sum of consecutive naturals, for example, 19551 + ... + 20203.

It is an arithmetic number, because the mean of its divisors is an integer number (961380).

Almost surely, 2^12979681 is an apocalyptic number.

12979681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12979681 is a deficient number, since it is larger than the sum of its proper divisors (2402399).

12979681 is a wasteful number, since it uses less digits than its factorization.

12979681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816.

The product of its digits is 54432, while the sum is 43.

The square root of 12979681 is about 3602.7324352497. The cubic root of 12979681 is about 235.0109003545.

The spelling of 12979681 in words is "twelve million, nine hundred seventy-nine thousand, six hundred eighty-one".