639479367 has 10 divisors (see below), whose sum is σ = 955271768. Its totient is φ = 426319524.

The previous prime is 639479339. The next prime is 639479383. The reversal of 639479367 is 763974936.

It is not a de Polignac number, because 639479367 - 2⁶ = 639479303 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 (639479567) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3947323 + ... + 3947484.

Almost surely, 2^639479367 is an apocalyptic number.

639479367 is a deficient number, since it is larger than the sum of its proper divisors (315792401).

639479367 is an equidigital number, since it uses as much as digits as its factorization.

639479367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7894819 (or 7894810 counting only the distinct ones).

The product of its digits is 5143824, while the sum is 54.

The square root of 639479367 is about 25287.9292746559. The cubic root of 639479367 is about 861.5401314109.

The spelling of 639479367 in words is "six hundred thirty-nine million, four hundred seventy-nine thousand, three hundred sixty-seven".