640043419 has 2 divisors, whose sum is σ = 640043420. Its totient is φ = 640043418.

The previous prime is 640043359. The next prime is 640043441. The reversal of 640043419 is 914340046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 640043419 - 2¹¹ = 640041371 is a prime.

It is a super-2 number, since 2×640043419² = 819311156410419122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (640043479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320021709 + 320021710.

It is an arithmetic number, because the mean of its divisors is an integer number (320021710).

Almost surely, 2^640043419 is an apocalyptic number.

640043419 is a deficient number, since it is larger than the sum of its proper divisors (1).

640043419 is an equidigital number, since it uses as much as digits as its factorization.

640043419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 640043419 is about 25299.0794101287. The cubic root of 640043419 is about 861.7933637804.

The spelling of 640043419 in words is "six hundred forty million, forty-three thousand, four hundred nineteen".