138297138 has 32 divisors (see below), whose sum is σ = 326307840. Its totient is φ = 38238480.

The previous prime is 138297119. The next prime is 138297139. The reversal of 138297138 is 831792831.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 138297138.

It is not an unprimeable number, because it can be changed into a prime (138297139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51808 + ... + 54411.

It is an arithmetic number, because the mean of its divisors is an integer number (10197120).

Almost surely, 2^138297138 is an apocalyptic number.

138297138 is an abundant number, since it is smaller than the sum of its proper divisors (188010702).

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

138297138 is a wasteful number, since it uses less digits than its factorization.

138297138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106262.

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

The square root of 138297138 is about 11759.9803571265. The cubic root of 138297138 is about 517.1355542726.

The spelling of 138297138 in words is "one hundred thirty-eight million, two hundred ninety-seven thousand, one hundred thirty-eight".