139638 has 24 divisors (see below), whose sum is σ = 303912. Its totient is φ = 42624.

The previous prime is 139627. The next prime is 139661. The reversal of 139638 is 836931.

139638 is nontrivially palindromic in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3756 + ... + 3792.

It is an arithmetic number, because the mean of its divisors is an integer number (12663).

2¹³⁹⁶³⁸ is an apocalyptic number.

139638 is an abundant number, since it is smaller than the sum of its proper divisors (164274).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139638 is a wasteful number, since it uses less digits than its factorization.

139638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 59 counting only the distinct ones).

The product of its digits is 3888, while the sum is 30.

The square root of 139638 is about 373.6816827194. The cubic root of 139638 is about 51.8801480351.

It can be divided in two parts, 139 and 638, that added together give a palindrome (777).

The spelling of 139638 in words is "one hundred thirty-nine thousand, six hundred thirty-eight".