13920081 has 16 divisors (see below), whose sum is σ = 21297024. Its totient is φ = 7922304.

The previous prime is 13920061. The next prime is 13920113. The reversal of 13920081 is 18002931.

13920081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13920081 - 2⁹ = 13919569 is a prime.

It is a super-2 number, since 2×13920081² = 387537310093122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13920031) 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, 4621 + ... + 7013.

It is an arithmetic number, because the mean of its divisors is an integer number (1331064).

Almost surely, 2^13920081 is an apocalyptic number.

It is an amenable number.

13920081 is a deficient number, since it is larger than the sum of its proper divisors (7376943).

13920081 is a wasteful number, since it uses less digits than its factorization.

13920081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2680.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 13920081 is about 3730.9624763591. The cubic root of 13920081 is about 240.5547410774.

The spelling of 13920081 in words is "thirteen million, nine hundred twenty thousand, eighty-one".