639882097 has 4 divisors (see below), whose sum is σ = 654763120. Its totient is φ = 625001076.

The previous prime is 639882079. The next prime is 639882119. The reversal of 639882097 is 790288936.

639882097 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 639882097 - 2⁷ = 639881969 is a prime.

It is a super-2 number, since 2×639882097² = 818898196122234818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639882697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7440447 + ... + 7440532.

It is an arithmetic number, because the mean of its divisors is an integer number (163690780).

Almost surely, 2^639882097 is an apocalyptic number.

It is an amenable number.

639882097 is a deficient number, since it is larger than the sum of its proper divisors (14881023).

639882097 is a wasteful number, since it uses less digits than its factorization.

639882097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14881022.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The square root of 639882097 is about 25295.8909113714. The cubic root of 639882097 is about 861.7209531141.

The spelling of 639882097 in words is "six hundred thirty-nine million, eight hundred eighty-two thousand, ninety-seven".