1804489 has 2 divisors, whose sum is σ = 1804490. Its totient is φ = 1804488.

The previous prime is 1804477. The next prime is 1804493. The reversal of 1804489 is 9844081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1177225 + 627264 = 1085^2 + 792^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1804489 is a prime.

It is a super-2 number, since 2×1804489² = 6512361102242, which contains 22 as substring.

1804489 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1804459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 902244 + 902245.

It is an arithmetic number, because the mean of its divisors is an integer number (902245).

2^1804489 is an apocalyptic number.

It is an amenable number.

1804489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1804489 is an equidigital number, since it uses as much as digits as its factorization.

1804489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 1804489 is about 1343.3126962848. The cubic root of 1804489 is about 121.7450782050.

The spelling of 1804489 in words is "one million, eight hundred four thousand, four hundred eighty-nine".