818920 has 32 divisors (see below), whose sum is σ = 1879200. Its totient is φ = 321088.

The previous prime is 818897. The next prime is 818947. The reversal of 818920 is 29818.

It is a plaindrome in base 15.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2187 + ... + 2533.

It is an arithmetic number, because the mean of its divisors is an integer number (58725).

2⁸¹⁸⁹²⁰ 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 818920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (939600).

818920 is an abundant number, since it is smaller than the sum of its proper divisors (1060280).

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

818920 is a wasteful number, since it uses less digits than its factorization.

818920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417 (or 413 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 818920 is about 904.9419870909. The cubic root of 818920 is about 93.5579059267.

The spelling of 818920 in words is "eight hundred eighteen thousand, nine hundred twenty".