138545992 has 64 divisors (see below), whose sum is σ = 293932800. Its totient is φ = 60775680.

The previous prime is 138545977. The next prime is 138545999. The reversal of 138545992 is 299545831.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (138545999) 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, 213813 + ... + 214459.

It is an arithmetic number, because the mean of its divisors is an integer number (4592700).

Almost surely, 2^138545992 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 138545992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146966400).

138545992 is an abundant number, since it is smaller than the sum of its proper divisors (155386808).

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

138545992 is a wasteful number, since it uses less digits than its factorization.

138545992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766 (or 762 counting only the distinct ones).

The product of its digits is 388800, while the sum is 46.

The square root of 138545992 is about 11770.5561465888. The cubic root of 138545992 is about 517.4455489707.

The spelling of 138545992 in words is "one hundred thirty-eight million, five hundred forty-five thousand, nine hundred ninety-two".