12940979 has 4 divisors (see below), whose sum is σ = 13241976. Its totient is φ = 12639984.

The previous prime is 12940969. The next prime is 12940987. The reversal of 12940979 is 97904921.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12940979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12940909) 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, 150434 + ... + 150519.

It is an arithmetic number, because the mean of its divisors is an integer number (3310494).

Almost surely, 2^12940979 is an apocalyptic number.

12940979 is a deficient number, since it is larger than the sum of its proper divisors (300997).

12940979 is an equidigital number, since it uses as much as digits as its factorization.

12940979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300996.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 12940979 is about 3597.3572244079. The cubic root of 12940979 is about 234.7770875488. Note that the first 3 decimals are identical.

The spelling of 12940979 in words is "twelve million, nine hundred forty thousand, nine hundred seventy-nine".