639913323 has 8 divisors (see below), whose sum is σ = 975106048. Its totient is φ = 365664744.

The previous prime is 639913321. The next prime is 639913343. The reversal of 639913323 is 323319936.

It is a happy number.

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

It is not a de Polignac number, because 639913323 - 2¹ = 639913321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639913321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15236011 + ... + 15236052.

It is an arithmetic number, because the mean of its divisors is an integer number (121888256).

Almost surely, 2^639913323 is an apocalyptic number.

639913323 is a deficient number, since it is larger than the sum of its proper divisors (335192725).

639913323 is a wasteful number, since it uses less digits than its factorization.

639913323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30472073.

The product of its digits is 78732, while the sum is 39.

The square root of 639913323 is about 25296.5081187108. The cubic root of 639913323 is about 861.7349701031.

The spelling of 639913323 in words is "six hundred thirty-nine million, nine hundred thirteen thousand, three hundred twenty-three".