639165 has 8 divisors (see below), whose sum is σ = 1022688. Its totient is φ = 340880.

The previous prime is 639157. The next prime is 639167. The reversal of 639165 is 561936.

It is a happy number.

639165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 639165 - 2³ = 639157 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 639165.

It is not an unprimeable number, because it can be changed into a prime (639167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21291 + ... + 21320.

It is an arithmetic number, because the mean of its divisors is an integer number (127836).

2⁶³⁹¹⁶⁵ is an apocalyptic number.

It is an amenable number.

639165 is a deficient number, since it is larger than the sum of its proper divisors (383523).

639165 is a wasteful number, since it uses less digits than its factorization.

639165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42619.

The product of its digits is 4860, while the sum is 30.

The square root of 639165 is about 799.4779546679. The cubic root of 639165 is about 86.1398931035.

The spelling of 639165 in words is "six hundred thirty-nine thousand, one hundred sixty-five".