402990811 has 4 divisors (see below), whose sum is σ = 404425224. Its totient is φ = 401556400.

The previous prime is 402990803. The next prime is 402990857. The reversal of 402990811 is 118099204.

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 402990811 - 2³ = 402990803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402990881) 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 in 3 ways as a sum of consecutive naturals, for example, 716785 + ... + 717346.

It is an arithmetic number, because the mean of its divisors is an integer number (101106306).

Almost surely, 2^402990811 is an apocalyptic number.

402990811 is a deficient number, since it is larger than the sum of its proper divisors (1434413).

402990811 is a wasteful number, since it uses less digits than its factorization.

402990811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434412.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 402990811 is about 20074.6310302332. The cubic root of 402990811 is about 738.6381154287.

The spelling of 402990811 in words is "four hundred two million, nine hundred ninety thousand, eight hundred eleven".