138879 has 12 divisors (see below), whose sum is σ = 216216. Its totient is φ = 85392.

The previous prime is 138869. The next prime is 138883. The reversal of 138879 is 978831.

It is not a de Polignac number, because 138879 - 2⁴ = 138863 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 138879.

It is not an unprimeable number, because it can be changed into a prime (138829) 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, 477 + ... + 710.

It is an arithmetic number, because the mean of its divisors is an integer number (18018).

2¹³⁸⁸⁷⁹ is an apocalyptic number.

138879 is a deficient number, since it is larger than the sum of its proper divisors (77337).

138879 is a wasteful number, since it uses less digits than its factorization.

138879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206 (or 1203 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 138879 is about 372.6647286771. The cubic root of 138879 is about 51.7859793203.

Adding to 138879 its product of digits (12096), we get a triangular number (150975 = T₅₄₉).

The spelling of 138879 in words is "one hundred thirty-eight thousand, eight hundred seventy-nine".