639545403 has 24 divisors (see below), whose sum is σ = 1013064192. Its totient is φ = 357675024.

The previous prime is 639545363. The next prime is 639545419. The reversal of 639545403 is 304545936.

639545403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 639545403 - 2⁸ = 639545147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639545443) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39375 + ... + 53192.

It is an arithmetic number, because the mean of its divisors is an integer number (42211008).

Almost surely, 2^639545403 is an apocalyptic number.

639545403 is a deficient number, since it is larger than the sum of its proper divisors (373518789).

639545403 is a wasteful number, since it uses less digits than its factorization.

639545403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92631 (or 92624 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 39.

The square root of 639545403 is about 25289.2349231842. The cubic root of 639545403 is about 861.5697861107.

The spelling of 639545403 in words is "six hundred thirty-nine million, five hundred forty-five thousand, four hundred three".