138893775 has 12 divisors (see below), whose sum is σ = 229637832. Its totient is φ = 74076640.

The previous prime is 138893759. The next prime is 138893779. The reversal of 138893775 is 577398831.

It is not a de Polignac number, because 138893775 - 2⁴ = 138893759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138893779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 925884 + ... + 926033.

It is an arithmetic number, because the mean of its divisors is an integer number (19136486).

Almost surely, 2^138893775 is an apocalyptic number.

138893775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138893775 is a deficient number, since it is larger than the sum of its proper divisors (90744057).

138893775 is a wasteful number, since it uses less digits than its factorization.

138893775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851930 (or 1851925 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 51.

The square root of 138893775 is about 11785.3203180906. The cubic root of 138893775 is about 517.8781571677.

The spelling of 138893775 in words is "one hundred thirty-eight million, eight hundred ninety-three thousand, seven hundred seventy-five".