1804321 has 2 divisors, whose sum is σ = 1804322. Its totient is φ = 1804320.

The previous prime is 1804307. The next prime is 1804349. The reversal of 1804321 is 1234081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1073296 + 731025 = 1036^2 + 855^2 .

It is a cyclic number.

It is not a de Polignac number, because 1804321 - 2¹³ = 1796129 is a prime.

It is equal to p₁₃₅₃₆₁ and since 1804321 and 135361 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1804381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 902160 + 902161.

It is an arithmetic number, because the mean of its divisors is an integer number (902161).

2^1804321 is an apocalyptic number.

It is an amenable number.

1804321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1804321 is an equidigital number, since it uses as much as digits as its factorization.

1804321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1804321 is about 1343.2501628513. The cubic root of 1804321 is about 121.7412998855.

The spelling of 1804321 in words is "one million, eight hundred four thousand, three hundred twenty-one".