640308419 has 2 divisors, whose sum is σ = 640308420. Its totient is φ = 640308418.

The previous prime is 640308413. The next prime is 640308457. The reversal of 640308419 is 914803046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640308419 - 2¹² = 640304323 is a prime.

It is a super-2 number, since 2×640308419² = 819989742884559122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (640308413) 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 as a sum of consecutive naturals, namely, 320154209 + 320154210.

It is an arithmetic number, because the mean of its divisors is an integer number (320154210).

Almost surely, 2^640308419 is an apocalyptic number.

640308419 is a deficient number, since it is larger than the sum of its proper divisors (1).

640308419 is an equidigital number, since it uses as much as digits as its factorization.

640308419 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 640308419 is about 25304.3162128519. The cubic root of 640308419 is about 861.9122847387.

The spelling of 640308419 in words is "six hundred forty million, three hundred eight thousand, four hundred nineteen".