639996303 has 4 divisors (see below), whose sum is σ = 853328408. Its totient is φ = 426664200.

The previous prime is 639996277. The next prime is 639996311. The reversal of 639996303 is 303699936.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 639996303 - 2⁶ = 639996239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639996353) 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, 106666048 + ... + 106666053.

It is an arithmetic number, because the mean of its divisors is an integer number (213332102).

Almost surely, 2^639996303 is an apocalyptic number.

639996303 is a deficient number, since it is larger than the sum of its proper divisors (213332105).

639996303 is a wasteful number, since it uses less digits than its factorization.

639996303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213332104.

The product of its (nonzero) digits is 708588, while the sum is 48.

The square root of 639996303 is about 25298.1482128633. The cubic root of 639996303 is about 861.7722166460.

The spelling of 639996303 in words is "six hundred thirty-nine million, nine hundred ninety-six thousand, three hundred three".