639332 has 6 divisors (see below), whose sum is σ = 1118838. Its totient is φ = 319664.

The previous prime is 639329. The next prime is 639337. The reversal of 639332 is 233936.

It can be written as a sum of positive squares in only one way, i.e., 343396 + 295936 = 586^2 + 544^2 .

It is not an unprimeable number, because it can be changed into a prime (639337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79913 + ... + 79920.

It is an arithmetic number, because the mean of its divisors is an integer number (186473).

2⁶³⁹³³² is an apocalyptic number.

It is an amenable number.

639332 is a deficient number, since it is larger than the sum of its proper divisors (479506).

639332 is a wasteful number, since it uses less digits than its factorization.

639332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159837 (or 159835 counting only the distinct ones).

The product of its digits is 2916, while the sum is 26.

The square root of 639332 is about 799.5823910017. The cubic root of 639332 is about 86.1473946144.

The spelling of 639332 in words is "six hundred thirty-nine thousand, three hundred thirty-two".