639848467 has 2 divisors, whose sum is σ = 639848468. Its totient is φ = 639848466.

The previous prime is 639848441. The next prime is 639848483. The reversal of 639848467 is 764848936.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-639848467 is a prime.

It is not a weakly prime, because it can be changed into another prime (639848267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319924233 + 319924234.

It is an arithmetic number, because the mean of its divisors is an integer number (319924234).

Almost surely, 2^639848467 is an apocalyptic number.

639848467 is a deficient number, since it is larger than the sum of its proper divisors (1).

639848467 is an equidigital number, since it uses as much as digits as its factorization.

639848467 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6967296, while the sum is 55.

The square root of 639848467 is about 25295.2261701689. The cubic root of 639848467 is about 861.7058564875.

The spelling of 639848467 in words is "six hundred thirty-nine million, eight hundred forty-eight thousand, four hundred sixty-seven".