639463859 has 8 divisors (see below), whose sum is σ = 659503680. Its totient is φ = 619569216.

The previous prime is 639463849. The next prime is 639463883. The reversal of 639463859 is 958364936.

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 639463859 - 2¹⁶ = 639398323 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 639463859.

It is not an unprimeable number, because it can be changed into a prime (639463849) 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, 27314 + ... + 44999.

It is an arithmetic number, because the mean of its divisors is an integer number (82437960).

Almost surely, 2^639463859 is an apocalyptic number.

639463859 is a deficient number, since it is larger than the sum of its proper divisors (20039821).

639463859 is a wasteful number, since it uses less digits than its factorization.

639463859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72589.

The product of its digits is 4199040, while the sum is 53.

The square root of 639463859 is about 25287.6226442898. The cubic root of 639463859 is about 861.5331669577.

The spelling of 639463859 in words is "six hundred thirty-nine million, four hundred sixty-three thousand, eight hundred fifty-nine".