138764155 has 4 divisors (see below), whose sum is σ = 166516992. Its totient is φ = 111011320.

The previous prime is 138764111. The next prime is 138764161. The reversal of 138764155 is 551467831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 138764155 - 2⁷ = 138764027 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13876411 + ... + 13876420.

It is an arithmetic number, because the mean of its divisors is an integer number (41629248).

Almost surely, 2^138764155 is an apocalyptic number.

138764155 is a deficient number, since it is larger than the sum of its proper divisors (27752837).

138764155 is an equidigital number, since it uses as much as digits as its factorization.

138764155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27752836.

The product of its digits is 100800, while the sum is 40.

The square root of 138764155 is about 11779.8198203538. The cubic root of 138764155 is about 517.7170070146.

The spelling of 138764155 in words is "one hundred thirty-eight million, seven hundred sixty-four thousand, one hundred fifty-five".