138439674 has 24 divisors (see below), whose sum is σ = 301635360. Its totient is φ = 45887688.

The previous prime is 138439673. The next prime is 138439709. The reversal of 138439674 is 476934831.

It is not an unprimeable number, because it can be changed into a prime (138439673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18262 + ... + 24705.

It is an arithmetic number, because the mean of its divisors is an integer number (12568140).

Almost surely, 2^138439674 is an apocalyptic number.

138439674 is an abundant number, since it is smaller than the sum of its proper divisors (163195686).

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

138439674 is a wasteful number, since it uses less digits than its factorization.

138439674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43154 (or 43151 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 138439674 is about 11766.0390106442. The cubic root of 138439674 is about 517.3131552596.

The spelling of 138439674 in words is "one hundred thirty-eight million, four hundred thirty-nine thousand, six hundred seventy-four".