138709086 has 32 divisors (see below), whose sum is σ = 294658560. Its totient is φ = 43380096.

The previous prime is 138709061. The next prime is 138709091. The reversal of 138709086 is 680907831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33435 + ... + 37353.

It is an arithmetic number, because the mean of its divisors is an integer number (9208080).

Almost surely, 2^138709086 is an apocalyptic number.

138709086 is an abundant number, since it is smaller than the sum of its proper divisors (155949474).

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

138709086 is a wasteful number, since it uses less digits than its factorization.

138709086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4288.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 138709086 is about 11777.4821587638. The cubic root of 138709086 is about 517.6485120680.

The spelling of 138709086 in words is "one hundred thirty-eight million, seven hundred nine thousand, eighty-six".