138970864 has 40 divisors (see below), whose sum is σ = 287699840. Its totient is φ = 64836288.

The previous prime is 138970859. The next prime is 138970873. The reversal of 138970864 is 468079831.

It is a happy number.

It is a congruent number.

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, 16957 + ... + 23779.

It is an arithmetic number, because the mean of its divisors is an integer number (7192496).

Almost surely, 2^138970864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138970864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143849920).

138970864 is an abundant number, since it is smaller than the sum of its proper divisors (148728976).

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

138970864 is a wasteful number, since it uses less digits than its factorization.

138970864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6917 (or 6911 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 138970864 is about 11788.5904161609. The cubic root of 138970864 is about 517.9739505790.

The spelling of 138970864 in words is "one hundred thirty-eight million, nine hundred seventy thousand, eight hundred sixty-four".