204404721 has 8 divisors (see below), whose sum is σ = 279187104. Its totient is φ = 132946080.

The previous prime is 204404701. The next prime is 204404723. The reversal of 204404721 is 127404402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 204404721 - 2⁵ = 204404689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 204404691 and 204404700.

It is not an unprimeable number, because it can be changed into a prime (204404723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 830791 + ... + 831036.

It is an arithmetic number, because the mean of its divisors is an integer number (34898388).

Almost surely, 2^204404721 is an apocalyptic number.

It is an amenable number.

204404721 is a deficient number, since it is larger than the sum of its proper divisors (74782383).

204404721 is a wasteful number, since it uses less digits than its factorization.

204404721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661871.

The product of its (nonzero) digits is 1792, while the sum is 24.

The square root of 204404721 is about 14297.0179058432. The cubic root of 204404721 is about 589.0655715108.

The spelling of 204404721 in words is "two hundred four million, four hundred four thousand, seven hundred twenty-one".