918220 has 24 divisors (see below), whose sum is σ = 1991808. Its totient is φ = 355200.

The previous prime is 918209. The next prime is 918223. The reversal of 918220 is 22819.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 918191 and 918200.

It is not an unprimeable number, because it can be changed into a prime (918223) by changing a digit.

918220 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121 + ... + 1360.

It is an arithmetic number, because the mean of its divisors is an integer number (82992).

2⁹¹⁸²²⁰ is an apocalyptic number.

It is an amenable number.

918220 is an abundant number, since it is smaller than the sum of its proper divisors (1073588).

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

918220 is a wasteful number, since it uses less digits than its factorization.

918220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521 (or 1519 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 918220 is about 958.2379662693. The cubic root of 918220 is about 97.1961171938.

The spelling of 918220 in words is "nine hundred eighteen thousand, two hundred twenty".