639953203 has 2 divisors, whose sum is σ = 639953204. Its totient is φ = 639953202.

The previous prime is 639953201. The next prime is 639953207. The reversal of 639953203 is 302359936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 639953203 - 2¹ = 639953201 is a prime.

Together with 639953201, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (639953201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319976601 + 319976602.

It is an arithmetic number, because the mean of its divisors is an integer number (319976602).

Almost surely, 2^639953203 is an apocalyptic number.

639953203 is a deficient number, since it is larger than the sum of its proper divisors (1).

639953203 is an equidigital number, since it uses as much as digits as its factorization.

639953203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131220, while the sum is 40.

The square root of 639953203 is about 25297.2963575162. The cubic root of 639953203 is about 861.7528711091.

The spelling of 639953203 in words is "six hundred thirty-nine million, nine hundred fifty-three thousand, two hundred three".