402866 has 16 divisors (see below), whose sum is σ = 657720. Its totient is φ = 184960.

The previous prime is 402863. The next prime is 402869. The reversal of 402866 is 668204.

It is an interprime number because it is at equal distance from previous prime (402863) and next prime (402869).

It can be written as a sum of positive squares in 4 ways, for example, as 265225 + 137641 = 515^2 + 371^2 .

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 402866.

It is not an unprimeable number, because it can be changed into a prime (402863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9806 + ... + 9846.

2⁴⁰²⁸⁶⁶ is an apocalyptic number.

402866 is a deficient number, since it is larger than the sum of its proper divisors (254854).

402866 is an equidigital number, since it uses as much as digits as its factorization.

402866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94 (or 60 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 402866 is about 634.7172598882. The cubic root of 402866 is about 73.8561852581.

The spelling of 402866 in words is "four hundred two thousand, eight hundred sixty-six".