18984709 has 2 divisors, whose sum is σ = 18984710. Its totient is φ = 18984708.

The previous prime is 18984703. The next prime is 18984731. The reversal of 18984709 is 90748981.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18948609 + 36100 = 4353^2 + 190^2 .

It is an emirp because it is prime and its reverse (90748981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18984709 - 2³ = 18984701 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18984701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9492354 + 9492355.

It is an arithmetic number, because the mean of its divisors is an integer number (9492355).

Almost surely, 2^18984709 is an apocalyptic number.

It is an amenable number.

18984709 is a deficient number, since it is larger than the sum of its proper divisors (1).

18984709 is an equidigital number, since it uses as much as digits as its factorization.

18984709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 18984709 is about 4357.1445925055. The cubic root of 18984709 is about 266.7685622751.

The spelling of 18984709 in words is "eighteen million, nine hundred eighty-four thousand, seven hundred nine".