138715 has 4 divisors (see below), whose sum is σ = 166464. Its totient is φ = 110968.

The previous prime is 138683. The next prime is 138727. The reversal of 138715 is 517831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138715 - 2⁵ = 138683 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138715.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13867 + ... + 13876.

It is an arithmetic number, because the mean of its divisors is an integer number (41616).

2¹³⁸⁷¹⁵ is an apocalyptic number.

138715 is a deficient number, since it is larger than the sum of its proper divisors (27749).

138715 is an equidigital number, since it uses as much as digits as its factorization.

138715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27748.

The product of its digits is 840, while the sum is 25.

The square root of 138715 is about 372.4446267568. Note that the first 3 decimals coincide. The cubic root of 138715 is about 51.7655868783.

The spelling of 138715 in words is "one hundred thirty-eight thousand, seven hundred fifteen".