640301839 has 2 divisors, whose sum is σ = 640301840. Its totient is φ = 640301838.

The previous prime is 640301773. The next prime is 640301887. The reversal of 640301839 is 938103046.

640301839 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 640301839 - 2²³ = 631913231 is a prime.

It is equal to p_33315478 and since 640301839 and 33315478 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640301339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320150919 + 320150920.

It is an arithmetic number, because the mean of its divisors is an integer number (320150920).

Almost surely, 2^640301839 is an apocalyptic number.

640301839 is a deficient number, since it is larger than the sum of its proper divisors (1).

640301839 is an equidigital number, since it uses as much as digits as its factorization.

640301839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 640301839 is about 25304.1861951733. The cubic root of 640301839 is about 861.9093323061.

The spelling of 640301839 in words is "six hundred forty million, three hundred one thousand, eight hundred thirty-nine".