12911979 has 8 divisors (see below), whose sum is σ = 17269312. Its totient is φ = 8581320.

The previous prime is 12911957. The next prime is 12911999. The reversal of 12911979 is 97911921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12911979 - 2⁷ = 12911851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12911909) 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 7 ways as a sum of consecutive naturals, for example, 5509 + ... + 7494.

It is an arithmetic number, because the mean of its divisors is an integer number (2158664).

Almost surely, 2^12911979 is an apocalyptic number.

12911979 is a deficient number, since it is larger than the sum of its proper divisors (4357333).

12911979 is a wasteful number, since it uses less digits than its factorization.

12911979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13337.

The product of its digits is 10206, while the sum is 39.

The square root of 12911979 is about 3593.3242269520. The cubic root of 12911979 is about 234.6015823384.

The spelling of 12911979 in words is "twelve million, nine hundred eleven thousand, nine hundred seventy-nine".