12639479 has 2 divisors, whose sum is σ = 12639480. Its totient is φ = 12639478.

The previous prime is 12639469. The next prime is 12639481. The reversal of 12639479 is 97493621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12639479 - 2²⁰ = 11590903 is a prime.

Together with 12639481, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12639469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6319739 + 6319740.

It is an arithmetic number, because the mean of its divisors is an integer number (6319740).

Almost surely, 2^12639479 is an apocalyptic number.

12639479 is a deficient number, since it is larger than the sum of its proper divisors (1).

12639479 is an equidigital number, since it uses as much as digits as its factorization.

12639479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 41.

The square root of 12639479 is about 3555.2044948216. The cubic root of 12639479 is about 232.9394563540.

The spelling of 12639479 in words is "twelve million, six hundred thirty-nine thousand, four hundred seventy-nine".