1804081 has 4 divisors (see below), whose sum is σ = 1817200. Its totient is φ = 1790964.

The previous prime is 1804079. The next prime is 1804093.

1804081 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1804081 - 2¹ = 1804079 is a prime.

It is a super-2 number, since 2×1804081² = 6509416509122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1804381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6351 + ... + 6628.

It is an arithmetic number, because the mean of its divisors is an integer number (454300).

2^1804081 is an apocalyptic number.

It is an amenable number.

1804081 is a deficient number, since it is larger than the sum of its proper divisors (13119).

1804081 is a wasteful number, since it uses less digits than its factorization.

1804081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13118.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 1804081 is about 1343.1608243245. The cubic root of 1804081 is about 121.7359018794.

The spelling of 1804081 in words is "one million, eight hundred four thousand, eighty-one".