640410403 has 2 divisors, whose sum is σ = 640410404. Its totient is φ = 640410402.

The previous prime is 640410389. The next prime is 640410439. The reversal of 640410403 is 304014046.

It is a happy number.

640410403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640410403 is a prime.

It is not a weakly prime, because it can be changed into another prime (640410703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320205201 + 320205202.

It is an arithmetic number, because the mean of its divisors is an integer number (320205202).

Almost surely, 2^640410403 is an apocalyptic number.

640410403 is a deficient number, since it is larger than the sum of its proper divisors (1).

640410403 is an equidigital number, since it uses as much as digits as its factorization.

640410403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 640410403 is about 25306.3312829023. The cubic root of 640410403 is about 861.9580421651.

Adding to 640410403 its reverse (304014046), we get a palindrome (944424449).

It can be divided in two parts, 6404 and 10403, that added together give a 5-th power (16807 = 7⁵).

The spelling of 640410403 in words is "six hundred forty million, four hundred ten thousand, four hundred three".