13639944 has 32 divisors (see below), whose sum is σ = 34895520. Its totient is φ = 4440576.

The previous prime is 13639937. The next prime is 13639961. The reversal of 13639944 is 44993631.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5577 + ... + 7640.

It is an arithmetic number, because the mean of its divisors is an integer number (1090485).

Almost surely, 2^13639944 is an apocalyptic number.

It is an amenable number.

13639944 is an abundant number, since it is smaller than the sum of its proper divisors (21255576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13639944 is a wasteful number, since it uses less digits than its factorization.

13639944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13269 (or 13265 counting only the distinct ones).

The product of its digits is 69984, while the sum is 39.

The square root of 13639944 is about 3693.2294810910. The cubic root of 13639944 is about 238.9300986615.

The spelling of 13639944 in words is "thirteen million, six hundred thirty-nine thousand, nine hundred forty-four".