204381409 has 4 divisors (see below), whose sum is σ = 208237716. Its totient is φ = 200525104.

The previous prime is 204381407. The next prime is 204381413. The reversal of 204381409 is 904183402.

204381409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 55175184 + 149206225 = 7428^2 + 12215^2 .

It is a cyclic number.

It is not a de Polignac number, because 204381409 - 2¹ = 204381407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204381407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1928074 + ... + 1928179.

It is an arithmetic number, because the mean of its divisors is an integer number (52059429).

Almost surely, 2^204381409 is an apocalyptic number.

It is an amenable number.

204381409 is a deficient number, since it is larger than the sum of its proper divisors (3856307).

204381409 is an equidigital number, since it uses as much as digits as its factorization.

204381409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3856306.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 204381409 is about 14296.2026076857. The cubic root of 204381409 is about 589.0431766942.

The spelling of 204381409 in words is "two hundred four million, three hundred eighty-one thousand, four hundred nine".