13639879 has 4 divisors (see below), whose sum is σ = 14879880. Its totient is φ = 12399880.

The previous prime is 13639867. The next prime is 13639919. The reversal of 13639879 is 97893631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97893631 = 11 ⋅8899421.

It is a cyclic number.

It is not a de Polignac number, because 13639879 - 2¹⁹ = 13115591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13639819) 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, 619984 + ... + 620005.

It is an arithmetic number, because the mean of its divisors is an integer number (3719970).

Almost surely, 2^13639879 is an apocalyptic number.

13639879 is a deficient number, since it is larger than the sum of its proper divisors (1240001).

13639879 is a wasteful number, since it uses less digits than its factorization.

13639879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240000.

The product of its digits is 244944, while the sum is 46.

The square root of 13639879 is about 3693.2206811941. The cubic root of 13639879 is about 238.9297191272.

The spelling of 13639879 in words is "thirteen million, six hundred thirty-nine thousand, eight hundred seventy-nine".