13138256 has 20 divisors (see below), whose sum is σ = 26144532. Its totient is φ = 6391296.

The previous prime is 13138249. The next prime is 13138259. The reversal of 13138256 is 65283131.

It can be written as a sum of positive squares in 2 ways, for example, as 12138256 + 1000000 = 3484^2 + 1000^2 .

It is a super-2 number, since 2×13138256² = 345227541443072, which contains 22 as substring.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13138259) 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, 10505 + ... + 11688.

Almost surely, 2^13138256 is an apocalyptic number.

13138256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13138256 is a deficient number, since it is larger than the sum of its proper divisors (13006276).

13138256 is a wasteful number, since it uses less digits than its factorization.

13138256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22238 (or 22232 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 13138256 is about 3624.6732266509. The cubic root of 13138256 is about 235.9640853133.

The spelling of 13138256 in words is "thirteen million, one hundred thirty-eight thousand, two hundred fifty-six".