13138444 has 12 divisors (see below), whose sum is σ = 25082568. Its totient is φ = 5972000.

The previous prime is 13138439. The next prime is 13138453. The reversal of 13138444 is 44483131.

It is a super-2 number, since 2×13138444² = 345237421482272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149257 + ... + 149344.

It is an arithmetic number, because the mean of its divisors is an integer number (2090214).

Almost surely, 2^13138444 is an apocalyptic number.

It is an amenable number.

13138444 is a deficient number, since it is larger than the sum of its proper divisors (11944124).

13138444 is a wasteful number, since it uses less digits than its factorization.

13138444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298616 (or 298614 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The square root of 13138444 is about 3624.6991599304. The cubic root of 13138444 is about 235.9652108060.

The spelling of 13138444 in words is "thirteen million, one hundred thirty-eight thousand, four hundred forty-four".