639294953 has 16 divisors (see below), whose sum is σ = 707374080. Its totient is φ = 572928000.

The previous prime is 639294907. The next prime is 639294961. The reversal of 639294953 is 359492936.

It is a cyclic number.

It is not a de Polignac number, because 639294953 - 2¹⁰ = 639293929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639294553) 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 15 ways as a sum of consecutive naturals, for example, 284408 + ... + 286646.

It is an arithmetic number, because the mean of its divisors is an integer number (44210880).

Almost surely, 2^639294953 is an apocalyptic number.

It is an amenable number.

639294953 is a deficient number, since it is larger than the sum of its proper divisors (68079127).

639294953 is a wasteful number, since it uses less digits than its factorization.

639294953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2608.

The product of its digits is 1574640, while the sum is 50.

The square root of 639294953 is about 25284.2827266268. The cubic root of 639294953 is about 861.4573060454.

It can be divided in two parts, 639 and 294953, that added together give a palindrome (295592).

The spelling of 639294953 in words is "six hundred thirty-nine million, two hundred ninety-four thousand, nine hundred fifty-three".