13901985 has 12 divisors (see below), whose sum is σ = 24096852. Its totient is φ = 7414368.

The previous prime is 13901957. The next prime is 13901999. The reversal of 13901985 is 58910931.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2692881 + 11209104 = 1641^2 + 3348^2 .

It is not a de Polignac number, because 13901985 - 2¹⁴ = 13885601 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154422 + ... + 154511.

It is an arithmetic number, because the mean of its divisors is an integer number (2008071).

Almost surely, 2^13901985 is an apocalyptic number.

13901985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13901985 is a deficient number, since it is larger than the sum of its proper divisors (10194867).

13901985 is a wasteful number, since it uses less digits than its factorization.

13901985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308944 (or 308941 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 13901985 is about 3728.5365761918. The cubic root of 13901985 is about 240.4504560932.

It can be divided in two parts, 1390 and 1985, that added together give a cube (3375 = 15³).

The spelling of 13901985 in words is "thirteen million, nine hundred one thousand, nine hundred eighty-five".