1813224 has 64 divisors (see below), whose sum is σ = 5322240. Its totient is φ = 504000.

The previous prime is 1813223. The next prime is 1813277. The reversal of 1813224 is 4223181.

It is a Harshad number since it is a multiple of its sum of digits (21).

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

It is a self number, because there is not a number n which added to its sum of digits gives 1813224.

It is not an unprimeable number, because it can be changed into a prime (1813223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7099 + ... + 7349.

It is an arithmetic number, because the mean of its divisors is an integer number (83160).

2^1813224 is an apocalyptic number.

1813224 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 1813224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2661120).

1813224 is an abundant number, since it is smaller than the sum of its proper divisors (3509016).

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

1813224 is a wasteful number, since it uses less digits than its factorization.

1813224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 306 counting only the distinct ones).

The product of its digits is 384, while the sum is 21.

The square root of 1813224 is about 1346.5600617871. The cubic root of 1813224 is about 121.9412061060.

The spelling of 1813224 in words is "one million, eight hundred thirteen thousand, two hundred twenty-four".