108639 has 6 divisors (see below), whose sum is σ = 156936. Its totient is φ = 72420.

The previous prime is 108637. The next prime is 108643. The reversal of 108639 is 936801.

It is not a de Polignac number, because 108639 - 2¹ = 108637 is a prime.

It is a super-3 number, since 3×108639³ = 3846613334763357, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6027 + ... + 6044.

It is an arithmetic number, because the mean of its divisors is an integer number (26156).

2¹⁰⁸⁶³⁹ is an apocalyptic number.

108639 is a deficient number, since it is larger than the sum of its proper divisors (48297).

108639 is a wasteful number, since it uses less digits than its factorization.

108639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12077 (or 12074 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 108639 is about 329.6043082243. The cubic root of 108639 is about 47.7157681609.

It can be divided in two parts, 108 and 639, that added together give a palindrome (747).

The spelling of 108639 in words is "one hundred eight thousand, six hundred thirty-nine".