138924729 has 6 divisors (see below), whose sum is σ = 200669066. Its totient is φ = 92616480.

The previous prime is 138924727. The next prime is 138924791. The reversal of 138924729 is 927429831.

138924729 is a `hidden beast` number, since 1 + 389 + 247 + 29 = 666.

138924729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 131056704 + 7868025 = 11448^2 + 2805^2 .

It is not a de Polignac number, because 138924729 - 2¹ = 138924727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138924727) 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, 7718032 + ... + 7718049.

Almost surely, 2^138924729 is an apocalyptic number.

It is an amenable number.

138924729 is a deficient number, since it is larger than the sum of its proper divisors (61744337).

138924729 is a wasteful number, since it uses less digits than its factorization.

138924729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15436087 (or 15436084 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 138924729 is about 11786.6334888296. The cubic root of 138924729 is about 517.9166259179.

The spelling of 138924729 in words is "one hundred thirty-eight million, nine hundred twenty-four thousand, seven hundred twenty-nine".