138621392 has 160 divisors (see below), whose sum is σ = 354144000. Its totient is φ = 52157952.

The previous prime is 138621361. The next prime is 138621401. The reversal of 138621392 is 293126831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2068943 + ... + 2069009.

It is an arithmetic number, because the mean of its divisors is an integer number (2213400).

Almost surely, 2^138621392 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 138621392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177072000).

138621392 is an abundant number, since it is smaller than the sum of its proper divisors (215522608).

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

138621392 is a wasteful number, since it uses less digits than its factorization.

138621392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 118 counting only the distinct ones).

The product of its digits is 15552, while the sum is 35.

The square root of 138621392 is about 11773.7586182153. The cubic root of 138621392 is about 517.5394006423.

The spelling of 138621392 in words is "one hundred thirty-eight million, six hundred twenty-one thousand, three hundred ninety-two".