1918220 has 12 divisors (see below), whose sum is σ = 4028304. Its totient is φ = 767280.

The previous prime is 1918219. The next prime is 1918237. The reversal of 1918220 is 228191.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47936 + ... + 47975.

It is an arithmetic number, because the mean of its divisors is an integer number (335692).

2^1918220 is an apocalyptic number.

1918220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1918220 is an abundant number, since it is smaller than the sum of its proper divisors (2110084).

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

1918220 is a wasteful number, since it uses less digits than its factorization.

1918220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95920 (or 95918 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1918220 is about 1384.9981949447. The cubic root of 1918220 is about 124.2508795164.

The spelling of 1918220 in words is "one million, nine hundred eighteen thousand, two hundred twenty".