138255956 has 12 divisors (see below), whose sum is σ = 242110260. Its totient is φ = 69081600.

The previous prime is 138255947. The next prime is 138255961. The reversal of 138255956 is 659552831.

138255956 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 114147856 + 24108100 = 10684^2 + 4910^2 .

It is a super-2 number, since 2×138255956² = 38229418738947872, which contains 22 as substring.

It is a congruent number.

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, 4391 + ... + 17198.

It is an arithmetic number, because the mean of its divisors is an integer number (20175855).

Almost surely, 2^138255956 is an apocalyptic number.

It is an amenable number.

138255956 is a deficient number, since it is larger than the sum of its proper divisors (103854304).

138255956 is a wasteful number, since it uses less digits than its factorization.

138255956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23194 (or 23192 counting only the distinct ones).

The product of its digits is 324000, while the sum is 44.

The square root of 138255956 is about 11758.2292884601. The cubic root of 138255956 is about 517.0842184534.

The spelling of 138255956 in words is "one hundred thirty-eight million, two hundred fifty-five thousand, nine hundred fifty-six".