13139520 has 56 divisors (see below), whose sum is σ = 41721024. Its totient is φ = 3503616.

The previous prime is 13139519. The next prime is 13139537. The reversal of 13139520 is 2593131.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5884 + ... + 7803.

Almost surely, 2^13139520 is an apocalyptic number.

13139520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13139520 is an abundant number, since it is smaller than the sum of its proper divisors (28581504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13139520 is a wasteful number, since it uses less digits than its factorization.

13139520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13707 (or 13697 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 13139520 is about 3624.8475830026. The cubic root of 13139520 is about 235.9716522496.

The spelling of 13139520 in words is "thirteen million, one hundred thirty-nine thousand, five hundred twenty".