639030897 has 8 divisors (see below), whose sum is σ = 946712480. Its totient is φ = 426020580.

The previous prime is 639030893. The next prime is 639030907. The reversal of 639030897 is 798030936.

It is a happy number.

639030897 is a `hidden beast` number, since 639 + 0 + 3 + 0 + 8 + 9 + 7 = 666.

639030897 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 639030897 - 2² = 639030893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639030893) 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, 11833879 + ... + 11833932.

It is an arithmetic number, because the mean of its divisors is an integer number (118339060).

Almost surely, 2^639030897 is an apocalyptic number.

It is an amenable number.

639030897 is a deficient number, since it is larger than the sum of its proper divisors (307681583).

639030897 is a wasteful number, since it uses less digits than its factorization.

639030897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23667820 (or 23667814 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 639030897 is about 25279.0604453567. The cubic root of 639030897 is about 861.3386835456.

The spelling of 639030897 in words is "six hundred thirty-nine million, thirty thousand, eight hundred ninety-seven".