13891408 has 40 divisors (see below), whose sum is σ = 28076576. Its totient is φ = 6652800.

The previous prime is 13891399. The next prime is 13891433. The reversal of 13891408 is 80419831.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41803 + ... + 42133.

Almost surely, 2^13891408 is an apocalyptic number.

It is an amenable number.

13891408 is an abundant number, since it is smaller than the sum of its proper divisors (14185168).

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

13891408 is a wasteful number, since it uses less digits than its factorization.

13891408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 13891408 is about 3727.1179213972. The cubic root of 13891408 is about 240.3894602537.

The spelling of 13891408 in words is "thirteen million, eight hundred ninety-one thousand, four hundred eight".