639852897 has 8 divisors (see below), whose sum is σ = 882555840. Its totient is φ = 411859280.

The previous prime is 639852869. The next prime is 639852907. The reversal of 639852897 is 798258936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 639852897 - 2¹⁴ = 639836513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639853897) 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, 3677229 + ... + 3677402.

It is an arithmetic number, because the mean of its divisors is an integer number (110319480).

Almost surely, 2^639852897 is an apocalyptic number.

It is an amenable number.

639852897 is a deficient number, since it is larger than the sum of its proper divisors (242702943).

639852897 is a wasteful number, since it uses less digits than its factorization.

639852897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7354663.

The product of its digits is 6531840, while the sum is 57.

The square root of 639852897 is about 25295.3137359472. The cubic root of 639852897 is about 861.7078451605.

It can be divided in two parts, 6398 and 52897, that added together give a palindrome (59295).

The spelling of 639852897 in words is "six hundred thirty-nine million, eight hundred fifty-two thousand, eight hundred ninety-seven".