118639 has 4 divisors (see below), whose sum is σ = 122760. Its totient is φ = 114520.

The previous prime is 118633. The next prime is 118661. The reversal of 118639 is 936811.

It is a happy number.

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 118639 - 2⁹ = 118127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2017 + ... + 2074.

It is an arithmetic number, because the mean of its divisors is an integer number (30690).

2¹¹⁸⁶³⁹ is an apocalyptic number.

118639 is a deficient number, since it is larger than the sum of its proper divisors (4121).

118639 is an equidigital number, since it uses as much as digits as its factorization.

118639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4120.

The product of its digits is 1296, while the sum is 28.

The square root of 118639 is about 344.4401254210. The cubic root of 118639 is about 49.1370590039.

It can be divided in two parts, 1186 and 39, that added together give a triangular number (1225 = T₄₉).

The spelling of 118639 in words is "one hundred eighteen thousand, six hundred thirty-nine".