1823220 has 72 divisors (see below), whose sum is σ = 6324864. Its totient is φ = 416448.

The previous prime is 1823219. The next prime is 1823231. The reversal of 1823220 is 223281.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1823193 and 1823202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 537 + ... + 1983.

2^1823220 is an apocalyptic number.

1823220 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 1823220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3162432).

1823220 is an abundant number, since it is smaller than the sum of its proper divisors (4501644).

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

1823220 is a wasteful number, since it uses less digits than its factorization.

1823220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1469 (or 1464 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1823220 is about 1350.2666403344. The cubic root of 1823220 is about 122.1648760667.

The spelling of 1823220 in words is "one million, eight hundred twenty-three thousand, two hundred twenty".