13479639 has 4 divisors (see below), whose sum is σ = 17972856. Its totient is φ = 8986424.

The previous prime is 13479601. The next prime is 13479643. The reversal of 13479639 is 93697431.

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

It is a cyclic number.

It is not a de Polignac number, because 13479639 - 2¹⁹ = 12955351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13479639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13479659) 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, 2246604 + ... + 2246609.

It is an arithmetic number, because the mean of its divisors is an integer number (4493214).

Almost surely, 2^13479639 is an apocalyptic number.

13479639 is a deficient number, since it is larger than the sum of its proper divisors (4493217).

13479639 is an equidigital number, since it uses as much as digits as its factorization.

13479639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4493216.

The product of its digits is 122472, while the sum is 42.

The square root of 13479639 is about 3671.4627875004. The cubic root of 13479639 is about 237.9903898857.

The spelling of 13479639 in words is "thirteen million, four hundred seventy-nine thousand, six hundred thirty-nine".