639002 has 16 divisors (see below), whose sum is σ = 1180032. Its totient is φ = 252720.

The previous prime is 638999. The next prime is 639007. The reversal of 639002 is 200936.

It is a happy number.

639002 is nontrivially palindromic in base 12.

It is not an unprimeable number, because it can be changed into a prime (639007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1574 + ... + 1937.

It is an arithmetic number, because the mean of its divisors is an integer number (73752).

2⁶³⁹⁰⁰² is an apocalyptic number.

639002 is a deficient number, since it is larger than the sum of its proper divisors (541030).

639002 is a wasteful number, since it uses less digits than its factorization.

639002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3533.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 639002 is about 799.3760066452. The cubic root of 639002 is about 86.1325700095.

Adding to 639002 its reverse (200936), we get a palindrome (839938).

The spelling of 639002 in words is "six hundred thirty-nine thousand, two".