13999881 has 16 divisors (see below), whose sum is σ = 21401600. Its totient is φ = 7974288.

The previous prime is 13999877. The next prime is 13999889. The reversal of 13999881 is 18899931.

It is not a de Polignac number, because 13999881 - 2² = 13999877 is a prime.

It is a super-2 number, since 2×13999881² = 391993336028322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13999881.

It is not an unprimeable number, because it can be changed into a prime (13999889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7080 + ... + 8838.

It is an arithmetic number, because the mean of its divisors is an integer number (1337600).

Almost surely, 2^13999881 is an apocalyptic number.

It is an amenable number.

13999881 is a deficient number, since it is larger than the sum of its proper divisors (7401719).

13999881 is a wasteful number, since it uses less digits than its factorization.

13999881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2148.

The product of its digits is 139968, while the sum is 48.

The square root of 13999881 is about 3741.6414846963. The cubic root of 13999881 is about 241.0135435419.

The spelling of 13999881 in words is "thirteen million, nine hundred ninety-nine thousand, eight hundred eighty-one".