818864 has 20 divisors (see below), whose sum is σ = 1614480. Its totient is φ = 402240.

The previous prime is 818837. The next prime is 818887. The reversal of 818864 is 468818.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

818864 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 3 ways as a sum of consecutive naturals, for example, 557 + ... + 1395.

It is an arithmetic number, because the mean of its divisors is an integer number (80724).

2⁸¹⁸⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

818864 is a deficient number, since it is larger than the sum of its proper divisors (795616).

818864 is a wasteful number, since it uses less digits than its factorization.

818864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908 (or 902 counting only the distinct ones).

The product of its digits is 12288, while the sum is 35.

The square root of 818864 is about 904.9110453520. The cubic root of 818864 is about 93.5557732958. Note that the first 3 decimals are identical.

The spelling of 818864 in words is "eight hundred eighteen thousand, eight hundred sixty-four".