13520139 has 8 divisors (see below), whose sum is σ = 18255360. Its totient is φ = 8899176.

The previous prime is 13520099. The next prime is 13520147. The reversal of 13520139 is 93102531.

It is a happy number.

13520139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13520139 - 2⁷ = 13520011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13520149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28287 + ... + 28760.

It is an arithmetic number, because the mean of its divisors is an integer number (2281920).

Almost surely, 2^13520139 is an apocalyptic number.

13520139 is a deficient number, since it is larger than the sum of its proper divisors (4735221).

13520139 is an equidigital number, since it uses as much as digits as its factorization.

13520139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57129.

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

The square root of 13520139 is about 3676.9741636297. The cubic root of 13520139 is about 238.2285014479.

The spelling of 13520139 in words is "thirteen million, five hundred twenty thousand, one hundred thirty-nine".