1909408489 has 2 divisors, whose sum is σ = 1909408490. Its totient is φ = 1909408488.

The previous prime is 1909408441. The next prime is 1909408493. The reversal of 1909408489 is 9848049091.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1577440089 + 331968400 = 39717^2 + 18220^2 .

It is a cyclic number.

It is not a de Polignac number, because 1909408489 - 2²¹ = 1907311337 is a prime.

It is not a weakly prime, because it can be changed into another prime (1909408429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 954704244 + 954704245.

It is an arithmetic number, because the mean of its divisors is an integer number (954704245).

Almost surely, 2^1909408489 is an apocalyptic number.

It is an amenable number.

1909408489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1909408489 is an equidigital number, since it uses as much as digits as its factorization.

1909408489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 52.

The square root of 1909408489 is about 43696.7789316329. The cubic root of 1909408489 is about 1240.6033503691.

The spelling of 1909408489 in words is "one billion, nine hundred nine million, four hundred eight thousand, four hundred eighty-nine".