639232 has 36 divisors (see below), whose sum is σ = 1398096. Its totient is φ = 289280.

The previous prime is 639211. The next prime is 639253. The reversal of 639232 is 232936.

It is an interprime number because it is at equal distance from previous prime (639211) and next prime (639253).

It is a junction number, because it is equal to n+sod(n) for n = 639197 and 639206.

It is an unprimeable number.

639232 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 (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2703 + ... + 2929.

It is an arithmetic number, because the mean of its divisors is an integer number (38836).

2⁶³⁹²³² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (699048).

639232 is an abundant number, since it is smaller than the sum of its proper divisors (758864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639232 is a wasteful number, since it uses less digits than its factorization.

639232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254 (or 240 counting only the distinct ones).

The product of its digits is 1944, while the sum is 25.

The square root of 639232 is about 799.5198559135. The cubic root of 639232 is about 86.1429028487.

The spelling of 639232 in words is "six hundred thirty-nine thousand, two hundred thirty-two".