1804090 has 16 divisors (see below), whose sum is σ = 3359880. Its totient is φ = 696640.

The previous prime is 1804079. The next prime is 1804093. The reversal of 1804090 is 904081.

It can be written as a sum of positive squares in 4 ways, for example, as 974169 + 829921 = 987^2 + 911^2 .

It is not an unprimeable number, because it can be changed into a prime (1804093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2821 + ... + 3400.

2^1804090 is an apocalyptic number.

1804090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1804090 is a deficient number, since it is larger than the sum of its proper divisors (1555790).

1804090 is a wasteful number, since it uses less digits than its factorization.

1804090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6257.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1804090 is about 1343.1641746265. The cubic root of 1804090 is about 121.7361043133.

Subtracting from 1804090 its reverse (904081), we obtain a palindrome (900009).

The spelling of 1804090 in words is "one million, eight hundred four thousand, ninety".