1918224 has 120 divisors (see below), whose sum is σ = 6731712. Its totient is φ = 495360.

The previous prime is 1918219. The next prime is 1918237. The reversal of 1918224 is 4228191.

It is a Cunningham number, because it is equal to 1385²-1.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11002 + ... + 11174.

2^1918224 is an apocalyptic number.

1918224 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1918224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3365856).

1918224 is an abundant number, since it is smaller than the sum of its proper divisors (4813488).

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

1918224 is a wasteful number, since it uses less digits than its factorization.

1918224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205 (or 196 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 1918224 is about 1384.9996389891. Note that the first 3 decimals coincide. The cubic root of 1918224 is about 124.2509658817.

The spelling of 1918224 in words is "one million, nine hundred eighteen thousand, two hundred twenty-four".