138788755 has 8 divisors (see below), whose sum is σ = 190338912. Its totient is φ = 95169408.

The previous prime is 138788743. The next prime is 138788759. The reversal of 138788755 is 557887831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138788755 - 2⁵ = 138788723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138788759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1982662 + ... + 1982731.

It is an arithmetic number, because the mean of its divisors is an integer number (23792364).

Almost surely, 2^138788755 is an apocalyptic number.

138788755 is a deficient number, since it is larger than the sum of its proper divisors (51550157).

138788755 is an equidigital number, since it uses as much as digits as its factorization.

138788755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3965405.

The product of its digits is 1881600, while the sum is 52.

The square root of 138788755 is about 11780.8639326664. The cubic root of 138788755 is about 517.7475986945.

The spelling of 138788755 in words is "one hundred thirty-eight million, seven hundred eighty-eight thousand, seven hundred fifty-five".