13968639 has 16 divisors (see below), whose sum is σ = 20930400. Its totient is φ = 9206208.

The previous prime is 13968637. The next prime is 13968641. The reversal of 13968639 is 93686931.

13968639 is a `hidden beast` number, since 1 + 3 + 9 + 6 + 8 + 639 = 666.

It is an interprime number because it is at equal distance from previous prime (13968637) and next prime (13968641).

It is not a de Polignac number, because 13968639 - 2¹ = 13968637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13968594 and 13968603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13968637) 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, 504 + ... + 5309.

It is an arithmetic number, because the mean of its divisors is an integer number (1308150).

Almost surely, 2^13968639 is an apocalyptic number.

13968639 is a deficient number, since it is larger than the sum of its proper divisors (6961761).

13968639 is an equidigital number, since it uses as much as digits as its factorization.

13968639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5911 (or 5905 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 13968639 is about 3737.4642473206. The cubic root of 13968639 is about 240.8341288459.

The spelling of 13968639 in words is "thirteen million, nine hundred sixty-eight thousand, six hundred thirty-nine".