13990239 has 16 divisors (see below), whose sum is σ = 20985440. Its totient is φ = 9325368.

The previous prime is 13990219. The next prime is 13990241. The reversal of 13990239 is 93209931.

It is not a de Polignac number, because 13990239 - 2¹³ = 13982047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13990219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1012 + ... + 5385.

It is an arithmetic number, because the mean of its divisors is an integer number (1311590).

Almost surely, 2^13990239 is an apocalyptic number.

13990239 is a deficient number, since it is larger than the sum of its proper divisors (6995201).

13990239 is an frugal number, since it uses more digits than its factorization.

13990239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6418 (or 6400 counting only the distinct ones).

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

The square root of 13990239 is about 3740.3527908474. The cubic root of 13990239 is about 240.9582005409.

The spelling of 13990239 in words is "thirteen million, nine hundred ninety thousand, two hundred thirty-nine".