639304093 has 16 divisors (see below), whose sum is σ = 670363776. Its totient is φ = 609094080.

The previous prime is 639304087. The next prime is 639304111. The reversal of 639304093 is 390403936.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-639304093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639304063) 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 15 ways as a sum of consecutive naturals, for example, 427455 + ... + 428947.

It is an arithmetic number, because the mean of its divisors is an integer number (41897736).

Almost surely, 2^639304093 is an apocalyptic number.

It is an amenable number.

639304093 is a deficient number, since it is larger than the sum of its proper divisors (31059683).

639304093 is a wasteful number, since it uses less digits than its factorization.

639304093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1764.

The product of its (nonzero) digits is 52488, while the sum is 37.

The square root of 639304093 is about 25284.4634706770. The cubic root of 639304093 is about 861.4614114442.

The spelling of 639304093 in words is "six hundred thirty-nine million, three hundred four thousand, ninety-three".