402817878 has 12 divisors (see below), whose sum is σ = 872772108. Its totient is φ = 134272620.

The previous prime is 402817867. The next prime is 402817889. The reversal of 402817878 is 878718204.

402817878 is a `hidden beast` number, since 402 + 8 + 178 + 78 = 666.

It is an interprime number because it is at equal distance from previous prime (402817867) and next prime (402817889).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11189368 + ... + 11189403.

It is an arithmetic number, because the mean of its divisors is an integer number (72731009).

Almost surely, 2^402817878 is an apocalyptic number.

402817878 is an abundant number, since it is smaller than the sum of its proper divisors (469954230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

402817878 is a wasteful number, since it uses less digits than its factorization.

402817878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22378779 (or 22378776 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 45.

The square root of 402817878 is about 20070.3233157814. The cubic root of 402817878 is about 738.5324445486.

The spelling of 402817878 in words is "four hundred two million, eight hundred seventeen thousand, eight hundred seventy-eight".