639322 has 8 divisors (see below), whose sum is σ = 962676. Its totient is φ = 318432.

The previous prime is 639311. The next prime is 639329. The reversal of 639322 is 223936.

It can be written as a sum of positive squares in 2 ways, for example, as 591361 + 47961 = 769^2 + 219^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (639329) by changing a digit.

639322 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318 + ... + 1174.

2⁶³⁹³²² is an apocalyptic number.

639322 is a deficient number, since it is larger than the sum of its proper divisors (323354).

639322 is a wasteful number, since it uses less digits than its factorization.

639322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232.

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

The square root of 639322 is about 799.5761377130. The cubic root of 639322 is about 86.1469454589.

It can be divided in two parts, 639 and 322, that added together give a square (961 = 31²).

The spelling of 639322 in words is "six hundred thirty-nine thousand, three hundred twenty-two".