639602 has 8 divisors (see below), whose sum is σ = 964956. Its totient is φ = 317952.

The previous prime is 639601. The next prime is 639631. The reversal of 639602 is 206936.

It can be written as a sum of positive squares in 2 ways, for example, as 606841 + 32761 = 779^2 + 181^2 .

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

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 639602.

It is not an unprimeable number, because it can be changed into a prime (639601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 443 + ... + 1214.

2⁶³⁹⁶⁰² is an apocalyptic number.

639602 is a deficient number, since it is larger than the sum of its proper divisors (325354).

639602 is a wasteful number, since it uses less digits than its factorization.

639602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1852.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 639602 is about 799.7512113151. The cubic root of 639602 is about 86.1595200427.

The spelling of 639602 in words is "six hundred thirty-nine thousand, six hundred two".