138255958 has 4 divisors (see below), whose sum is σ = 207383940. Its totient is φ = 69127978.

The previous prime is 138255947. The next prime is 138255961. The reversal of 138255958 is 859552831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 859552831 = 223 ⋅3854497.

It is a super-2 number, since 2×138255958² = 38229419844995528, 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 as a sum of consecutive naturals, namely, 34563988 + ... + 34563991.

It is an arithmetic number, because the mean of its divisors is an integer number (51845985).

Almost surely, 2^138255958 is an apocalyptic number.

138255958 is a deficient number, since it is larger than the sum of its proper divisors (69127982).

138255958 is an equidigital number, since it uses as much as digits as its factorization.

138255958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69127981.

The product of its digits is 432000, while the sum is 46.

The square root of 138255958 is about 11758.2293735069. The cubic root of 138255958 is about 517.0842209467.

The spelling of 138255958 in words is "one hundred thirty-eight million, two hundred fifty-five thousand, nine hundred fifty-eight".