639932 has 12 divisors (see below), whose sum is σ = 1128120. Its totient is φ = 317616.

The previous prime is 639911. The next prime is 639937. The reversal of 639932 is 239936.

It is a d-powerful number, because it can be written as 6⁶ + 3¹⁰ + 9 + 9³ + 3¹² + 2¹¹ .

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639937) by changing a digit.

639932 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119 + ... + 1137.

It is an arithmetic number, because the mean of its divisors is an integer number (94010).

2⁶³⁹⁹³² is an apocalyptic number.

It is an amenable number.

639932 is a deficient number, since it is larger than the sum of its proper divisors (488188).

639932 is a wasteful number, since it uses less digits than its factorization.

639932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180 (or 1178 counting only the distinct ones).

The product of its digits is 8748, while the sum is 32.

The square root of 639932 is about 799.9574988710. The cubic root of 639932 is about 86.1743353774.

The spelling of 639932 in words is "six hundred thirty-nine thousand, nine hundred thirty-two".