639099853 has 24 divisors (see below), whose sum is σ = 795033792. Its totient is φ = 501513984.

The previous prime is 639099847. The next prime is 639099893. The reversal of 639099853 is 358990936.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-639099853 is a prime.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 639099853.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639099803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 160950 + ... + 164872.

It is an arithmetic number, because the mean of its divisors is an integer number (33126408).

Almost surely, 2^639099853 is an apocalyptic number.

It is an amenable number.

639099853 is a deficient number, since it is larger than the sum of its proper divisors (155933939).

639099853 is a wasteful number, since it uses less digits than its factorization.

639099853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4021 (or 3984 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 52.

The square root of 639099853 is about 25280.4243041924. The cubic root of 639099853 is about 861.3696639642.

The spelling of 639099853 in words is "six hundred thirty-nine million, ninety-nine thousand, eight hundred fifty-three".