1809384449 has 2 divisors, whose sum is σ = 1809384450. Its totient is φ = 1809384448.

The previous prime is 1809384431. The next prime is 1809384463. The reversal of 1809384449 is 9444839081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1786583824 + 22800625 = 42268^2 + 4775^2 .

It is a cyclic number.

It is not a de Polignac number, because 1809384449 - 2¹⁶ = 1809318913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1809384397 and 1809384406.

It is not a weakly prime, because it can be changed into another prime (1809384349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 904692224 + 904692225.

It is an arithmetic number, because the mean of its divisors is an integer number (904692225).

Almost surely, 2^1809384449 is an apocalyptic number.

It is an amenable number.

1809384449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1809384449 is an equidigital number, since it uses as much as digits as its factorization.

1809384449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 50.

The square root of 1809384449 is about 42536.8598864561. The cubic root of 1809384449 is about 1218.5507401119.

The spelling of 1809384449 in words is "one billion, eight hundred nine million, three hundred eighty-four thousand, four hundred forty-nine".