139879 has 4 divisors (see below), whose sum is σ = 143176. Its totient is φ = 136584.

The previous prime is 139871. The next prime is 139883. The reversal of 139879 is 978931.

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 139879 - 2³ = 139871 is a prime.

It is a super-2 number, since 2×139879² = 39132269282, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1584 + ... + 1669.

It is an arithmetic number, because the mean of its divisors is an integer number (35794).

2¹³⁹⁸⁷⁹ is an apocalyptic number.

139879 is a deficient number, since it is larger than the sum of its proper divisors (3297).

139879 is an equidigital number, since it uses as much as digits as its factorization.

139879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3296.

The product of its digits is 13608, while the sum is 37.

The square root of 139879 is about 374.0040106737. The cubic root of 139879 is about 51.9099773785.

The spelling of 139879 in words is "one hundred thirty-nine thousand, eight hundred seventy-nine".