12979920 has 40 divisors (see below), whose sum is σ = 40238496. Its totient is φ = 3461248.

The previous prime is 12979919. The next prime is 12979927. The reversal of 12979920 is 2997921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12979927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26802 + ... + 27281.

Almost surely, 2^12979920 is an apocalyptic number.

12979920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12979920 is an abundant number, since it is smaller than the sum of its proper divisors (27258576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12979920 is a wasteful number, since it uses less digits than its factorization.

12979920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54099 (or 54093 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 12979920 is about 3602.7656043656. The cubic root of 12979920 is about 235.0123427952.

The spelling of 12979920 in words is "twelve million, nine hundred seventy-nine thousand, nine hundred twenty".