639466903 has 2 divisors, whose sum is σ = 639466904. Its totient is φ = 639466902.

The previous prime is 639466871. The next prime is 639466909. The reversal of 639466903 is 309664936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 639466903 - 2⁵ = 639466871 is a prime.

It is a super-2 number, since 2×639466903² = 817835840064822818, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639466909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319733451 + 319733452.

It is an arithmetic number, because the mean of its divisors is an integer number (319733452).

Almost surely, 2^639466903 is an apocalyptic number.

639466903 is a deficient number, since it is larger than the sum of its proper divisors (1).

639466903 is an equidigital number, since it uses as much as digits as its factorization.

639466903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 629856, while the sum is 46.

The square root of 639466903 is about 25287.6828317661. The cubic root of 639466903 is about 861.5345339898.

The spelling of 639466903 in words is "six hundred thirty-nine million, four hundred sixty-six thousand, nine hundred three".