1804549 has 2 divisors, whose sum is σ = 1804550. Its totient is φ = 1804548.

The previous prime is 1804547. The next prime is 1804559. The reversal of 1804549 is 9454081.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1803649 + 900 = 1343^2 + 30^2 .

It is a cyclic number.

It is not a de Polignac number, because 1804549 - 2¹ = 1804547 is a prime.

Together with 1804547, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1804549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1804547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 902274 + 902275.

It is an arithmetic number, because the mean of its divisors is an integer number (902275).

2^1804549 is an apocalyptic number.

It is an amenable number.

1804549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1804549 is an equidigital number, since it uses as much as digits as its factorization.

1804549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 1804549 is about 1343.3350289485. The cubic root of 1804549 is about 121.7464275480.

The spelling of 1804549 in words is "one million, eight hundred four thousand, five hundred forty-nine".