138270858 has 32 divisors (see below), whose sum is σ = 302968512. Its totient is φ = 41721600.

The previous prime is 138270841. The next prime is 138270863. The reversal of 138270858 is 858072831.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11560 + ... + 20252.

It is an arithmetic number, because the mean of its divisors is an integer number (9467766).

Almost surely, 2^138270858 is an apocalyptic number.

138270858 is an abundant number, since it is smaller than the sum of its proper divisors (164697654).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138270858 is a wasteful number, since it uses less digits than its factorization.

138270858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8950.

The product of its (nonzero) digits is 107520, while the sum is 42.

The square root of 138270858 is about 11758.8629552351. The cubic root of 138270858 is about 517.1027958620.

It can be divided in two parts, 138270 and 858, that added together give a triangular number (139128 = T₅₂₇).

The spelling of 138270858 in words is "one hundred thirty-eight million, two hundred seventy thousand, eight hundred fifty-eight".