138255959 has 8 divisors (see below), whose sum is σ = 141946992. Its totient is φ = 134605120.

The previous prime is 138255947. The next prime is 138255961. The reversal of 138255959 is 959552831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-138255959 is a prime.

It is a super-2 number, since 2×138255959² = 38229420398019362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138255919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3014 + ... + 16899.

It is an arithmetic number, because the mean of its divisors is an integer number (17743374).

Almost surely, 2^138255959 is an apocalyptic number.

138255959 is a deficient number, since it is larger than the sum of its proper divisors (3691033).

138255959 is a wasteful number, since it uses less digits than its factorization.

138255959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20097.

The product of its digits is 486000, while the sum is 47.

The square root of 138255959 is about 11758.2294160303. The cubic root of 138255959 is about 517.0842221934.

The spelling of 138255959 in words is "one hundred thirty-eight million, two hundred fifty-five thousand, nine hundred fifty-nine".