818844 has 48 divisors (see below), whose sum is σ = 2140320. Its totient is φ = 241920.

The previous prime is 818837. The next prime is 818887. The reversal of 818844 is 448818.

818844 = 32² + 33² + ... + 135².

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4434 + ... + 4614.

It is an arithmetic number, because the mean of its divisors is an integer number (44590).

2⁸¹⁸⁸⁴⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 818844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1070160).

818844 is an abundant number, since it is smaller than the sum of its proper divisors (1321476).

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

818844 is a wasteful number, since it uses less digits than its factorization.

818844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 228 counting only the distinct ones).

The product of its digits is 8192, while the sum is 33.

The square root of 818844 is about 904.8999944745. The cubic root of 818844 is about 93.5550116184. Note that the first 3 decimals are identical.

The spelling of 818844 in words is "eight hundred eighteen thousand, eight hundred forty-four".