13909239 has 10 divisors (see below), whose sum is σ = 20778120. Its totient is φ = 9272772.

The previous prime is 13909237. The next prime is 13909243. The reversal of 13909239 is 93290931.

It is not a de Polignac number, because 13909239 - 2¹ = 13909237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13909237) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 85779 + ... + 85940.

It is an arithmetic number, because the mean of its divisors is an integer number (2077812).

Almost surely, 2^13909239 is an apocalyptic number.

13909239 is a deficient number, since it is larger than the sum of its proper divisors (6868881).

13909239 is an equidigital number, since it uses as much as digits as its factorization.

13909239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171731 (or 171722 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 13909239 is about 3729.5092170418. The cubic root of 13909239 is about 240.4922708489.

The spelling of 13909239 in words is "thirteen million, nine hundred nine thousand, two hundred thirty-nine".