13920891 has 16 divisors (see below), whose sum is σ = 19289088. Its totient is φ = 8920800.

The previous prime is 13920887. The next prime is 13920913. The reversal of 13920891 is 19802931.

It is not a de Polignac number, because 13920891 - 2² = 13920887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13920811) 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, 16420 + ... + 17246.

It is an arithmetic number, because the mean of its divisors is an integer number (1205568).

Almost surely, 2^13920891 is an apocalyptic number.

13920891 is a deficient number, since it is larger than the sum of its proper divisors (5368197).

13920891 is a wasteful number, since it uses less digits than its factorization.

13920891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 13920891 is about 3731.0710258584. The cubic root of 13920891 is about 240.5594068922.

The spelling of 13920891 in words is "thirteen million, nine hundred twenty thousand, eight hundred ninety-one".