138445992 has 48 divisors (see below), whose sum is σ = 379491840. Its totient is φ = 45590688.

The previous prime is 138445991. The next prime is 138446059. The reversal of 138445992 is 299544831.

138445992 is a `hidden beast` number, since 13 + 8 + 44 + 599 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (138445991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5608 + ... + 17559.

It is an arithmetic number, because the mean of its divisors is an integer number (7906080).

Almost surely, 2^138445992 is an apocalyptic number.

138445992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138445992 is an abundant number, since it is smaller than the sum of its proper divisors (241045848).

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

138445992 is a wasteful number, since it uses less digits than its factorization.

138445992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23262 (or 23255 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 138445992 is about 11766.3074921574. The cubic root of 138445992 is about 517.3210247157.

The spelling of 138445992 in words is "one hundred thirty-eight million, four hundred forty-five thousand, nine hundred ninety-two".