12879939 has 4 divisors (see below), whose sum is σ = 17173256. Its totient is φ = 8586624.

The previous prime is 12879913. The next prime is 12879941. The reversal of 12879939 is 93997821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93997821 = 3 ⋅31332607.

It is a de Polignac number, because none of the positive numbers 2^k-12879939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12879239) 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, 2146654 + ... + 2146659.

It is an arithmetic number, because the mean of its divisors is an integer number (4293314).

Almost surely, 2^12879939 is an apocalyptic number.

12879939 is a deficient number, since it is larger than the sum of its proper divisors (4293317).

12879939 is an equidigital number, since it uses as much as digits as its factorization.

12879939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4293316.

The product of its digits is 244944, while the sum is 48.

The square root of 12879939 is about 3588.8631904825. The cubic root of 12879939 is about 234.4073735192.

The spelling of 12879939 in words is "twelve million, eight hundred seventy-nine thousand, nine hundred thirty-nine".