1845220 has 48 divisors (see below), whose sum is σ = 4290048. Its totient is φ = 662400.

The previous prime is 1845211. The next prime is 1845229. The reversal of 1845220 is 225481.

It is an interprime number because it is at equal distance from previous prime (1845211) and next prime (1845229).

It is a junction number, because it is equal to n+sod(n) for n = 1845191 and 1845200.

It is not an unprimeable number, because it can be changed into a prime (1845229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12145 + ... + 12295.

It is an arithmetic number, because the mean of its divisors is an integer number (89376).

2^1845220 is an apocalyptic number.

1845220 is a gapful number since it is divisible by the number (10) 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 1845220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2145024).

1845220 is an abundant number, since it is smaller than the sum of its proper divisors (2444828).

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

1845220 is a wasteful number, since it uses less digits than its factorization.

1845220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 1845220 is about 1358.3887514257. The cubic root of 1845220 is about 122.6542829076.

The spelling of 1845220 in words is "one million, eight hundred forty-five thousand, two hundred twenty".