138637755 has 12 divisors (see below), whose sum is σ = 240305520. Its totient is φ = 73940112.

The previous prime is 138637739. The next prime is 138637783. The reversal of 138637755 is 557736831.

138637755 is a `hidden beast` number, since 1 + 3 + 8 + 637 + 7 + 5 + 5 = 666.

138637755 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138637755 - 2⁴ = 138637739 is a prime.

It is a super-2 number, since 2×138637755² = 38440854222880050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 3080839 = 138637755 / (1 + 3 + 8 + 6 + 3 + 7 + 7 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 138637755.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1540375 + ... + 1540464.

It is an arithmetic number, because the mean of its divisors is an integer number (20025460).

Almost surely, 2^138637755 is an apocalyptic number.

138637755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138637755 is a deficient number, since it is larger than the sum of its proper divisors (101667765).

138637755 is a wasteful number, since it uses less digits than its factorization.

138637755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3080850 (or 3080847 counting only the distinct ones).

The product of its digits is 529200, while the sum is 45.

The square root of 138637755 is about 11774.4534905022. The cubic root of 138637755 is about 517.5597634543.

The spelling of 138637755 in words is "one hundred thirty-eight million, six hundred thirty-seven thousand, seven hundred fifty-five".