402890881 has 16 divisors (see below), whose sum is σ = 429105600. Its totient is φ = 377664448.

The previous prime is 402890861. The next prime is 402890927. The reversal of 402890881 is 188098204.

It is not a de Polignac number, because 402890881 - 2⁷ = 402890753 is a prime.

It is a super-2 number, since 2×402890881² = 324642123985912322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402890861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140595 + ... + 143431.

It is an arithmetic number, because the mean of its divisors is an integer number (26819100).

Almost surely, 2^402890881 is an apocalyptic number.

It is an amenable number.

402890881 is a deficient number, since it is larger than the sum of its proper divisors (26214719).

402890881 is a wasteful number, since it uses less digits than its factorization.

402890881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3008.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 402890881 is about 20072.1419136075. The cubic root of 402890881 is about 738.5770567918.

The spelling of 402890881 in words is "four hundred two million, eight hundred ninety thousand, eight hundred eighty-one".