866402 has 4 divisors (see below), whose sum is σ = 1299606. Its totient is φ = 433200.

The previous prime is 866399. The next prime is 866417. The reversal of 866402 is 204668.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 829921 + 36481 = 911^2 + 191^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216599 + ... + 216602.

2⁸⁶⁶⁴⁰² is an apocalyptic number.

866402 is a deficient number, since it is larger than the sum of its proper divisors (433204).

866402 is a wasteful number, since it uses less digits than its factorization.

866402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433203.

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

The square root of 866402 is about 930.8071765946. The cubic root of 866402 is about 95.3322438897.

The spelling of 866402 in words is "eight hundred sixty-six thousand, four hundred two".