138975 has 24 divisors (see below), whose sum is σ = 245520. Its totient is φ = 69120.

The previous prime is 138967. The next prime is 138977. The reversal of 138975 is 579831.

It is not a de Polignac number, because 138975 - 2³ = 138967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138977) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1221 + ... + 1329.

It is an arithmetic number, because the mean of its divisors is an integer number (10230).

2¹³⁸⁹⁷⁵ is an apocalyptic number.

138975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138975 is a deficient number, since it is larger than the sum of its proper divisors (106545).

138975 is a wasteful number, since it uses less digits than its factorization.

138975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 134 counting only the distinct ones).

The product of its digits is 7560, while the sum is 33.

The square root of 138975 is about 372.7935085272. The cubic root of 138975 is about 51.7979089112.

The spelling of 138975 in words is "one hundred thirty-eight thousand, nine hundred seventy-five".