639445367 has 8 divisors (see below), whose sum is σ = 700154112. Its totient is φ = 579166200.

The previous prime is 639445357. The next prime is 639445393. The reversal of 639445367 is 763544936.

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

It is a cyclic number.

It is not a de Polignac number, because 639445367 - 2⁴ = 639445351 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 (639445337) 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, 104273 + ... + 110234.

It is an arithmetic number, because the mean of its divisors is an integer number (87519264).

Almost surely, 2^639445367 is an apocalyptic number.

639445367 is a deficient number, since it is larger than the sum of its proper divisors (60708745).

639445367 is a wasteful number, since it uses less digits than its factorization.

639445367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214789.

The product of its digits is 1632960, while the sum is 47.

The square root of 639445367 is about 25287.2570082245. The cubic root of 639445367 is about 861.5248622794.

The spelling of 639445367 in words is "six hundred thirty-nine million, four hundred forty-five thousand, three hundred sixty-seven".