13581939 has 16 divisors (see below), whose sum is σ = 21088512. Its totient is φ = 7614048.

The previous prime is 13581907. The next prime is 13581959. The reversal of 13581939 is 93918531.

It is not a de Polignac number, because 13581939 - 2⁵ = 13581907 is a prime.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 13581897 and 13581906.

It is not an unprimeable number, because it can be changed into a prime (13581959) 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, 4989 + ... + 7214.

It is an arithmetic number, because the mean of its divisors is an integer number (1318032).

Almost surely, 2^13581939 is an apocalyptic number.

13581939 is a deficient number, since it is larger than the sum of its proper divisors (7506573).

13581939 is a wasteful number, since it uses less digits than its factorization.

13581939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12266.

The product of its digits is 29160, while the sum is 39.

The square root of 13581939 is about 3685.3682312627. The cubic root of 13581939 is about 238.5909273610.

The spelling of 13581939 in words is "thirteen million, five hundred eighty-one thousand, nine hundred thirty-nine".