13139444 has 12 divisors (see below), whose sum is σ = 23037924. Its totient is φ = 6557184.

The previous prime is 13139429. The next prime is 13139447. The reversal of 13139444 is 44493131.

It can be written as a sum of positive squares in 2 ways, for example, as 8352100 + 4787344 = 2890^2 + 2188^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13139447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 539 + ... + 5154.

It is an arithmetic number, because the mean of its divisors is an integer number (1919827).

Almost surely, 2^13139444 is an apocalyptic number.

It is an amenable number.

13139444 is a deficient number, since it is larger than the sum of its proper divisors (9898480).

13139444 is a wasteful number, since it uses less digits than its factorization.

13139444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6274 (or 6272 counting only the distinct ones).

The product of its digits is 5184, while the sum is 29.

The square root of 13139444 is about 3624.8370997881. The cubic root of 13139444 is about 235.9711972893.

The spelling of 13139444 in words is "thirteen million, one hundred thirty-nine thousand, four hundred forty-four".