639372399 has 8 divisors (see below), whose sum is σ = 853101312. Its totient is φ = 425945880.

The previous prime is 639372373. The next prime is 639372407. The reversal of 639372399 is 993273936.

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

It is not a de Polignac number, because 639372399 - 2⁸ = 639372143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639172399) 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, 70617 + ... + 79154.

It is an arithmetic number, because the mean of its divisors is an integer number (106637664).

Almost surely, 2^639372399 is an apocalyptic number.

639372399 is a deficient number, since it is larger than the sum of its proper divisors (213728913).

639372399 is a wasteful number, since it uses less digits than its factorization.

639372399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151197.

The product of its digits is 1653372, while the sum is 51.

The square root of 639372399 is about 25285.8141850327. The cubic root of 639372399 is about 861.4920910995.

The spelling of 639372399 in words is "six hundred thirty-nine million, three hundred seventy-two thousand, three hundred ninety-nine".