138631734 has 12 divisors (see below), whose sum is σ = 300368796. Its totient is φ = 46210572.

The previous prime is 138631723. The next prime is 138631739. The reversal of 138631734 is 437136831.

138631734 is a `hidden beast` number, since 13 + 8 + 631 + 7 + 3 + 4 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138631739) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3850864 + ... + 3850899.

It is an arithmetic number, because the mean of its divisors is an integer number (25030733).

Almost surely, 2^138631734 is an apocalyptic number.

138631734 is an abundant number, since it is smaller than the sum of its proper divisors (161737062).

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

138631734 is a wasteful number, since it uses less digits than its factorization.

138631734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7701771 (or 7701768 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 138631734 is about 11774.1978070695. The cubic root of 138631734 is about 517.5522708526.

The spelling of 138631734 in words is "one hundred thirty-eight million, six hundred thirty-one thousand, seven hundred thirty-four".