13991376 has 40 divisors (see below), whose sum is σ = 41308864. Its totient is φ = 3997440.

The previous prime is 13991371. The next prime is 13991381. The reversal of 13991376 is 67319931.

It is an interprime number because it is at equal distance from previous prime (13991371) and next prime (13991381).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13991371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20485 + ... + 21156.

Almost surely, 2^13991376 is an apocalyptic number.

13991376 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13991376 is an abundant number, since it is smaller than the sum of its proper divisors (27317488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13991376 is a wasteful number, since it uses less digits than its factorization.

13991376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41659 (or 41653 counting only the distinct ones).

The product of its digits is 30618, while the sum is 39.

The square root of 13991376 is about 3740.5047787698. The cubic root of 13991376 is about 240.9647279980.

It can be divided in two parts, 1399 and 1376, that added together give a triangular number (2775 = T₇₄).

The spelling of 13991376 in words is "thirteen million, nine hundred ninety-one thousand, three hundred seventy-six".