189639 has 12 divisors (see below), whose sum is σ = 288600. Its totient is φ = 119664.

The previous prime is 189619. The next prime is 189643. The reversal of 189639 is 936981.

189639 is a `hidden beast` number, since 18 + 9 + 639 = 666.

It is not a de Polignac number, because 189639 - 2⁹ = 189127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189619) 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, 384 + ... + 725.

It is an arithmetic number, because the mean of its divisors is an integer number (24050).

2¹⁸⁹⁶³⁹ is an apocalyptic number.

189639 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

189639 is a deficient number, since it is larger than the sum of its proper divisors (98961).

189639 is a wasteful number, since it uses less digits than its factorization.

189639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134 (or 1131 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 189639 is about 435.4756020720. The cubic root of 189639 is about 57.4525380241.

It can be divided in two parts, 189 and 639, that added together give a palindrome (828).

The spelling of 189639 in words is "one hundred eighty-nine thousand, six hundred thirty-nine".