13939509 has 8 divisors (see below), whose sum is σ = 18613152. Its totient is φ = 9279440.

The previous prime is 13939493. The next prime is 13939511. The reversal of 13939509 is 90593931.

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

It is a cyclic number.

It is not a de Polignac number, because 13939509 - 2⁴ = 13939493 is a prime.

It is a super-2 number, since 2×13939509² = 388619822322162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13939529) 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 7 ways as a sum of consecutive naturals, for example, 687 + ... + 5324.

It is an arithmetic number, because the mean of its divisors is an integer number (2326644).

Almost surely, 2^13939509 is an apocalyptic number.

It is an amenable number.

13939509 is a deficient number, since it is larger than the sum of its proper divisors (4673643).

13939509 is an equidigital number, since it uses as much as digits as its factorization.

13939509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6787.

The product of its (nonzero) digits is 32805, while the sum is 39.

The square root of 13939509 is about 3733.5651862529. The cubic root of 13939509 is about 240.6666016562. Note that the first 4 decimals are identical.

The spelling of 13939509 in words is "thirteen million, nine hundred thirty-nine thousand, five hundred nine".