13916639 has 16 divisors (see below), whose sum is σ = 15634944. Its totient is φ = 12280800.

The previous prime is 13916629. The next prime is 13916641. The reversal of 13916639 is 93661931.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13916639 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 (13916629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80357 + ... + 80529.

It is an arithmetic number, because the mean of its divisors is an integer number (977184).

Almost surely, 2^13916639 is an apocalyptic number.

13916639 is a deficient number, since it is larger than the sum of its proper divisors (1718305).

13916639 is a wasteful number, since it uses less digits than its factorization.

13916639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358.

The product of its digits is 26244, while the sum is 38.

The square root of 13916639 is about 3730.5011727649. The cubic root of 13916639 is about 240.5349122255.

It can be divided in two parts, 13916 and 639, that multiplied together give a square (8892324 = 2982²).

The spelling of 13916639 in words is "thirteen million, nine hundred sixteen thousand, six hundred thirty-nine".