640414943 has 4 divisors (see below), whose sum is σ = 731902800. Its totient is φ = 548927088.

The previous prime is 640414937. The next prime is 640414987. The reversal of 640414943 is 349414046.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 640414943 - 2⁴ = 640414927 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 (640414933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45743918 + ... + 45743931.

It is an arithmetic number, because the mean of its divisors is an integer number (182975700).

Almost surely, 2^640414943 is an apocalyptic number.

640414943 is a deficient number, since it is larger than the sum of its proper divisors (91487857).

640414943 is an equidigital number, since it uses as much as digits as its factorization.

640414943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91487856.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 640414943 is about 25306.4209836160. The cubic root of 640414943 is about 861.9600790257.

Adding to 640414943 its reverse (349414046), we get a palindrome (989828989).

The spelling of 640414943 in words is "six hundred forty million, four hundred fourteen thousand, nine hundred forty-three".