138755775 has 24 divisors (see below), whose sum is σ = 229834000. Its totient is φ = 73866240.

The previous prime is 138755759. The next prime is 138755789. The reversal of 138755775 is 577557831.

It is not a de Polignac number, because 138755775 - 2⁴ = 138755759 is a prime.

Its product of digits (1029000) is a multiple of the sum of its prime divisors (3430).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49101 + ... + 51849.

Almost surely, 2^138755775 is an apocalyptic number.

138755775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138755775 is a deficient number, since it is larger than the sum of its proper divisors (91078225).

138755775 is a wasteful number, since it uses less digits than its factorization.

138755775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3435 (or 3430 counting only the distinct ones).

The product of its digits is 1029000, while the sum is 48.

The square root of 138755775 is about 11779.4641219370. The cubic root of 138755775 is about 517.7065851208.

The spelling of 138755775 in words is "one hundred thirty-eight million, seven hundred fifty-five thousand, seven hundred seventy-five".