1804500 has 72 divisors (see below), whose sum is σ = 5706792. Its totient is φ = 480000.

The previous prime is 1804493. The next prime is 1804501. The reversal of 1804500 is 54081.

It can be written as a sum of positive squares in 4 ways, for example, as 30276 + 1774224 = 174^2 + 1332^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1804501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4300 + ... + 4700.

It is an arithmetic number, because the mean of its divisors is an integer number (79261).

2^1804500 is an apocalyptic number.

1804500 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 1804500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2853396).

1804500 is an abundant number, since it is smaller than the sum of its proper divisors (3902292).

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

1804500 is a wasteful number, since it uses less digits than its factorization.

1804500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426 (or 411 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1804500 is about 1343.3167906343. The cubic root of 1804500 is about 121.7453255868.

Adding to 1804500 its reverse (54081), we get a palindrome (1858581).

It can be divided in two parts, 1804 and 500, that added together give a square (2304 = 48²).

The spelling of 1804500 in words is "one million, eight hundred four thousand, five hundred".