138779432 has 32 divisors (see below), whose sum is σ = 300568320. Its totient is φ = 59370240.

The previous prime is 138779429. The next prime is 138779441. The reversal of 138779432 is 234977831.

It is a Harshad number since it is a multiple of its sum of digits (44).

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 7 ways as a sum of consecutive naturals, for example, 44888 + ... + 47879.

It is an arithmetic number, because the mean of its divisors is an integer number (9392760).

Almost surely, 2^138779432 is an apocalyptic number.

It is an amenable number.

138779432 is an abundant number, since it is smaller than the sum of its proper divisors (161788888).

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

138779432 is a wasteful number, since it uses less digits than its factorization.

138779432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92801 (or 92797 counting only the distinct ones).

The product of its digits is 254016, while the sum is 44.

The square root of 138779432 is about 11780.4682419673. The cubic root of 138779432 is about 517.7360053706.

The spelling of 138779432 in words is "one hundred thirty-eight million, seven hundred seventy-nine thousand, four hundred thirty-two".