639862473 has 24 divisors (see below), whose sum is σ = 913072032. Its totient is φ = 398477824.

The previous prime is 639862459. The next prime is 639862513. The reversal of 639862473 is 374268936.

It is not a de Polignac number, because 639862473 - 2⁸ = 639862217 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (639862073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116086 + ... + 121472.

It is an arithmetic number, because the mean of its divisors is an integer number (38044668).

Almost surely, 2^639862473 is an apocalyptic number.

It is an amenable number.

639862473 is a deficient number, since it is larger than the sum of its proper divisors (273209559).

639862473 is a wasteful number, since it uses less digits than its factorization.

639862473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5561 (or 5544 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 48.

The square root of 639862473 is about 25295.5030193116. The cubic root of 639862473 is about 861.7121438950.

The spelling of 639862473 in words is "six hundred thirty-nine million, eight hundred sixty-two thousand, four hundred seventy-three".