402808643 has 2 divisors, whose sum is σ = 402808644. Its totient is φ = 402808642.

The previous prime is 402808619. The next prime is 402808663. The reversal of 402808643 is 346808204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402808643 - 2¹⁴ = 402792259 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (402808663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201404321 + 201404322.

It is an arithmetic number, because the mean of its divisors is an integer number (201404322).

Almost surely, 2^402808643 is an apocalyptic number.

402808643 is a deficient number, since it is larger than the sum of its proper divisors (1).

402808643 is an equidigital number, since it uses as much as digits as its factorization.

402808643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36864, while the sum is 35.

The square root of 402808643 is about 20070.0932484132. The cubic root of 402808643 is about 738.5268006422.

The spelling of 402808643 in words is "four hundred two million, eight hundred eight thousand, six hundred forty-three".