866422 has 12 divisors (see below), whose sum is σ = 1381500. Its totient is φ = 407456.

The previous prime is 866417. The next prime is 866431. The reversal of 866422 is 224668.

It is an Ulam number.

It is a plaindrome in base 13.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 172 + ... + 1327.

It is an arithmetic number, because the mean of its divisors is an integer number (115125).

2⁸⁶⁶⁴²² is an apocalyptic number.

866422 is a deficient number, since it is larger than the sum of its proper divisors (515078).

866422 is a wasteful number, since it uses less digits than its factorization.

866422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535 (or 1518 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The square root of 866422 is about 930.8179198963. The cubic root of 866422 is about 95.3329774330.

It can be divided in two parts, 8 and 66422, that added together give a triangular number (66430 = T₃₆₄).

The spelling of 866422 in words is "eight hundred sixty-six thousand, four hundred twenty-two".