402890879 has 4 divisors (see below), whose sum is σ = 402940176. Its totient is φ = 402841584.

The previous prime is 402890861. The next prime is 402890927. The reversal of 402890879 is 978098204.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402890879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402890809) 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, 9134 + ... + 29819.

It is an arithmetic number, because the mean of its divisors is an integer number (100735044).

Almost surely, 2^402890879 is an apocalyptic number.

402890879 is a deficient number, since it is larger than the sum of its proper divisors (49297).

402890879 is a wasteful number, since it uses less digits than its factorization.

402890879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49296.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 402890879 is about 20072.1418637872. The cubic root of 402890879 is about 738.5770555697.

The spelling of 402890879 in words is "four hundred two million, eight hundred ninety thousand, eight hundred seventy-nine".