138191586 has 16 divisors (see below), whose sum is σ = 297643584. Its totient is φ = 42520464.

The previous prime is 138191549. The next prime is 138191663. The reversal of 138191586 is 685191831.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 885766 + ... + 885921.

It is an arithmetic number, because the mean of its divisors is an integer number (18602724).

Almost surely, 2^138191586 is an apocalyptic number.

138191586 is an abundant number, since it is smaller than the sum of its proper divisors (159451998).

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

138191586 is a wasteful number, since it uses less digits than its factorization.

138191586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771705.

The product of its digits is 51840, while the sum is 42.

The square root of 138191586 is about 11755.4917379070. The cubic root of 138191586 is about 517.0039569850.

The spelling of 138191586 in words is "one hundred thirty-eight million, one hundred ninety-one thousand, five hundred eighty-six".