639164 has 6 divisors (see below), whose sum is σ = 1118544. Its totient is φ = 319580.

The previous prime is 639157. The next prime is 639167. The reversal of 639164 is 461936.

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 639164.

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 as a sum of consecutive naturals, namely, 79892 + ... + 79899.

It is an arithmetic number, because the mean of its divisors is an integer number (186424).

2⁶³⁹¹⁶⁴ is an apocalyptic number.

It is an amenable number.

639164 is a deficient number, since it is larger than the sum of its proper divisors (479380).

639164 is a wasteful number, since it uses less digits than its factorization.

639164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159795 (or 159793 counting only the distinct ones).

The product of its digits is 3888, while the sum is 29.

The square root of 639164 is about 799.4773292596. The cubic root of 639164 is about 86.1398481804.

The spelling of 639164 in words is "six hundred thirty-nine thousand, one hundred sixty-four".