640389159 has 10 divisors (see below), whose sum is σ = 956630840. Its totient is φ = 426926052.

The previous prime is 640389157. The next prime is 640389173. The reversal of 640389159 is 951983046.

It is a happy number.

It is not a de Polignac number, because 640389159 - 2¹ = 640389157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640389151) 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 in 9 ways as a sum of consecutive naturals, for example, 3952939 + ... + 3953100.

It is an arithmetic number, because the mean of its divisors is an integer number (95663084).

Almost surely, 2^640389159 is an apocalyptic number.

640389159 is a deficient number, since it is larger than the sum of its proper divisors (316241681).

640389159 is an equidigital number, since it uses as much as digits as its factorization.

640389159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7906051 (or 7906042 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 640389159 is about 25305.9115425625. The cubic root of 640389159 is about 861.9485109650.

The spelling of 640389159 in words is "six hundred forty million, three hundred eighty-nine thousand, one hundred fifty-nine".