1984109 has 2 divisors, whose sum is σ = 1984110. Its totient is φ = 1984108.

The previous prime is 1984091. The next prime is 1984117. The reversal of 1984109 is 9014891.

Together with previous prime (1984091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1755625 + 228484 = 1325^2 + 478^2 .

It is an emirp because it is prime and its reverse (9014891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1984109 - 2⁸ = 1983853 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1984139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992054 + 992055.

It is an arithmetic number, because the mean of its divisors is an integer number (992055).

2^1984109 is an apocalyptic number.

It is an amenable number.

1984109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1984109 is an equidigital number, since it uses as much as digits as its factorization.

1984109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 1984109 is about 1408.5840408013. The cubic root of 1984109 is about 125.6575271993.

The spelling of 1984109 in words is "one million, nine hundred eighty-four thousand, one hundred nine".