1820304 has 30 divisors (see below), whose sum is σ = 5094726.
Its totient is φ = 606720.
The previous prime is 1820303. The next prime is 1820311. The reversal of 1820304 is 4030281.
It is a happy number.
It can be written as a sum of positive squares in only one way, i.e., 921600 + 898704 = 960^2 + 948^2
It is a Harshad number since it is a multiple of its sum of digits (18).
It is not an unprimeable number, because it can be changed into a prime (1820303) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6177 + ... + 6464.
21820304 is an apocalyptic number.
It is an amenable number.
1820304 is an abundant number, since it is smaller than the sum of its proper divisors (3274422).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1820304 is a wasteful number, since it uses less digits than its factorization.
1820304 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 12655 (or 12646 counting only the distinct ones).
The product of its (nonzero) digits is 192, while the sum is 18.
The square root of 1820304 is about 1349.1864215148.
The cubic root of 1820304 is about 122.0997124435.
Adding to 1820304 its reverse (4030281), we get a palindrome (5850585).
The spelling of 1820304 in words is "one million, eight hundred twenty thousand, three hundred four".