639930463 has 2 divisors, whose sum is σ = 639930464. Its totient is φ = 639930462.

The previous prime is 639930407. The next prime is 639930481. The reversal of 639930463 is 364039936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 639930463 - 2¹³ = 639922271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639930163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319965231 + 319965232.

It is an arithmetic number, because the mean of its divisors is an integer number (319965232).

Almost surely, 2^639930463 is an apocalyptic number.

639930463 is a deficient number, since it is larger than the sum of its proper divisors (1).

639930463 is an equidigital number, since it uses as much as digits as its factorization.

639930463 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928, while the sum is 43.

The square root of 639930463 is about 25296.8468983785. The cubic root of 639930463 is about 861.7426638563.

The spelling of 639930463 in words is "six hundred thirty-nine million, nine hundred thirty thousand, four hundred sixty-three".