1804320 has 144 divisors (see below), whose sum is σ = 7076160. Its totient is φ = 410112.

The previous prime is 1804307. The next prime is 1804321. The reversal of 1804320 is 234081.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1804293 and 1804302.

It is not an unprimeable number, because it can be changed into a prime (1804321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9991 + ... + 10169.

It is an arithmetic number, because the mean of its divisors is an integer number (49140).

2^1804320 is an apocalyptic number.

1804320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1804320 is the 672-nd decagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1804320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3538080).

1804320 is an abundant number, since it is smaller than the sum of its proper divisors (5271840).

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

1804320 is a wasteful number, since it uses less digits than its factorization.

1804320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207 (or 196 counting only the distinct ones).

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

The square root of 1804320 is about 1343.2497906197. The cubic root of 1804320 is about 121.7412773948.

The spelling of 1804320 in words is "one million, eight hundred four thousand, three hundred twenty".