639009002 has 8 divisors (see below), whose sum is σ = 959021856. Its totient is φ = 319335052.

The previous prime is 639009001. The next prime is 639009089. The reversal of 639009002 is 200900936.

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 (639009001) 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, 79958 + ... + 87585.

It is an arithmetic number, because the mean of its divisors is an integer number (119877732).

Almost surely, 2^639009002 is an apocalyptic number.

639009002 is a deficient number, since it is larger than the sum of its proper divisors (320012854).

639009002 is a wasteful number, since it uses less digits than its factorization.

639009002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169452.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 639009002 is about 25278.6273757101. The cubic root of 639009002 is about 861.3288461361.

Adding to 639009002 its reverse (200900936), we get a palindrome (839909938).

The spelling of 639009002 in words is "six hundred thirty-nine million, nine thousand, two".