1818220 has 12 divisors (see below), whose sum is σ = 3818304. Its totient is φ = 727280.

The previous prime is 1818209. The next prime is 1818221. The reversal of 1818220 is 228181.

It is a junction number, because it is equal to n+sod(n) for n = 1818191 and 1818200.

It is not an unprimeable number, because it can be changed into a prime (1818221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45436 + ... + 45475.

It is an arithmetic number, because the mean of its divisors is an integer number (318192).

2^1818220 is an apocalyptic number.

1818220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1818220 is an abundant number, since it is smaller than the sum of its proper divisors (2000084).

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

1818220 is a wasteful number, since it uses less digits than its factorization.

1818220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90920 (or 90918 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 1818220 is about 1348.4138830493. The cubic root of 1818220 is about 122.0530988068.

The spelling of 1818220 in words is "one million, eight hundred eighteen thousand, two hundred twenty".