138301992 has 48 divisors (see below), whose sum is σ = 388446240. Its totient is φ = 46100016.

The previous prime is 138301981. The next prime is 138302009. The reversal of 138301992 is 299103831.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33628 + ... + 37515.

It is an arithmetic number, because the mean of its divisors is an integer number (8092630).

Almost surely, 2^138301992 is an apocalyptic number.

138301992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138301992 is an abundant number, since it is smaller than the sum of its proper divisors (250144248).

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

138301992 is an equidigital number, since it uses as much as digits as its factorization.

138301992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71164 (or 71148 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 138301992 is about 11760.1867332113. The cubic root of 138301992 is about 517.1416044017.

The spelling of 138301992 in words is "one hundred thirty-eight million, three hundred one thousand, nine hundred ninety-two".