138375 has 32 divisors (see below), whose sum is σ = 262080. Its totient is φ = 72000.

The previous prime is 138373. The next prime is 138389. The reversal of 138375 is 573831.

It is not a de Polignac number, because 138375 - 2¹ = 138373 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138371) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3355 + ... + 3395.

It is an arithmetic number, because the mean of its divisors is an integer number (8190).

2¹³⁸³⁷⁵ is an apocalyptic number.

138375 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138375 is a deficient number, since it is larger than the sum of its proper divisors (123705).

138375 is an equidigital number, since it uses as much as digits as its factorization.

138375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65 (or 49 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 138375 is about 371.9879030291. The cubic root of 138375 is about 51.7232586057.

The spelling of 138375 in words is "one hundred thirty-eight thousand, three hundred seventy-five".