639364 has 18 divisors (see below), whose sum is σ = 1230782. Its totient is φ = 290400.

The previous prime is 639361. The next prime is 639371. The reversal of 639364 is 463936.

It can be written as a sum of positive squares in only one way, i.e., 627264 + 12100 = 792^2 + 110^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 177 + ... + 1144.

2⁶³⁹³⁶⁴ is an apocalyptic number.

It is an amenable number.

639364 is a deficient number, since it is larger than the sum of its proper divisors (591418).

639364 is a wasteful number, since it uses less digits than its factorization.

639364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347 (or 1334 counting only the distinct ones).

The product of its digits is 11664, while the sum is 31.

The square root of 639364 is about 799.6024011970. The cubic root of 639364 is about 86.1488318805.

The spelling of 639364 in words is "six hundred thirty-nine thousand, three hundred sixty-four".