13900509 has 24 divisors (see below), whose sum is σ = 24298560. Its totient is φ = 7475328.

The previous prime is 13900501. The next prime is 13900519. The reversal of 13900509 is 90500931.

It is not a de Polignac number, because 13900509 - 2³ = 13900501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13900501) 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 23 ways as a sum of consecutive naturals, for example, 5419 + ... + 7560.

It is an arithmetic number, because the mean of its divisors is an integer number (1012440).

Almost surely, 2^13900509 is an apocalyptic number.

It is an amenable number.

13900509 is a deficient number, since it is larger than the sum of its proper divisors (10398051).

13900509 is a wasteful number, since it uses less digits than its factorization.

13900509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13009 (or 13006 counting only the distinct ones).

The product of its (nonzero) digits is 1215, while the sum is 27.

The square root of 13900509 is about 3728.3386380531. The cubic root of 13900509 is about 240.4419460990.

The spelling of 13900509 in words is "thirteen million, nine hundred thousand, five hundred nine".