138191872 has 88 divisors (see below), whose sum is σ = 340227776. Its totient is φ = 54632448.

The previous prime is 138191869. The next prime is 138191897. The reversal of 138191872 is 278191831.

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, 92443 + ... + 93925.

Almost surely, 2^138191872 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 138191872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170113888).

138191872 is an abundant number, since it is smaller than the sum of its proper divisors (202035904).

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

138191872 is a wasteful number, since it uses less digits than its factorization.

138191872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1523 (or 1505 counting only the distinct ones).

The product of its digits is 24192, while the sum is 40.

The square root of 138191872 is about 11755.5039024280. The cubic root of 138191872 is about 517.0043136470.

The spelling of 138191872 in words is "one hundred thirty-eight million, one hundred ninety-one thousand, eight hundred seventy-two".