804023921 has 4 divisors (see below), whose sum is σ = 805510644. Its totient is φ = 802537200.

The previous prime is 804023917. The next prime is 804023929. The reversal of 804023921 is 129320408.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 187991521 + 616032400 = 13711^2 + 24820^2 .

It is a cyclic number.

It is not a de Polignac number, because 804023921 - 2² = 804023917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (804023929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 742550 + ... + 743631.

It is an arithmetic number, because the mean of its divisors is an integer number (201377661).

Almost surely, 2^804023921 is an apocalyptic number.

It is an amenable number.

804023921 is a deficient number, since it is larger than the sum of its proper divisors (1486723).

804023921 is a wasteful number, since it uses less digits than its factorization.

804023921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1486722.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 804023921 is about 28355.3155686901. The cubic root of 804023921 is about 929.8716132941.

The spelling of 804023921 in words is "eight hundred four million, twenty-three thousand, nine hundred twenty-one".