639304130 has 32 divisors (see below), whose sum is σ = 1222622640. Its totient is φ = 240226560.

The previous prime is 639304129. The next prime is 639304147. The reversal of 639304130 is 31403936.

It can be written as a sum of positive squares in 8 ways, for example, as 493595089 + 145709041 = 22217^2 + 12071^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a junction number, because it is equal to n+sod(n) for n = 639304093 and 639304102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19061 + ... + 40520.

Almost surely, 2^639304130 is an apocalyptic number.

639304130 is a deficient number, since it is larger than the sum of its proper divisors (583318510).

639304130 is a wasteful number, since it uses less digits than its factorization.

639304130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59654.

The product of its (nonzero) digits is 5832, while the sum is 29.

The square root of 639304130 is about 25284.4642023516. The cubic root of 639304130 is about 861.4614280634.

The spelling of 639304130 in words is "six hundred thirty-nine million, three hundred four thousand, one hundred thirty".