1804396409 has 4 divisors (see below), whose sum is σ = 1833976740. Its totient is φ = 1774816080.

The previous prime is 1804396403. The next prime is 1804396417. The reversal of 1804396409 is 9046934081.

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 70090384 + 1734306025 = 8372^2 + 41645^2 .

It is a cyclic number.

It is not a de Polignac number, because 1804396409 - 2¹² = 1804392313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1804396409.

It is not an unprimeable number, because it can be changed into a prime (1804396403) 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, 14790074 + ... + 14790195.

It is an arithmetic number, because the mean of its divisors is an integer number (458494185).

Almost surely, 2^1804396409 is an apocalyptic number.

It is an amenable number.

1804396409 is a deficient number, since it is larger than the sum of its proper divisors (29580331).

1804396409 is an equidigital number, since it uses as much as digits as its factorization.

1804396409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29580330.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 1804396409 is about 42478.1874495605. The cubic root of 1804396409 is about 1217.4299586274.

The spelling of 1804396409 in words is "one billion, eight hundred four million, three hundred ninety-six thousand, four hundred nine".