18204749 has 2 divisors, whose sum is σ = 18204750. Its totient is φ = 18204748.

The previous prime is 18204743. The next prime is 18204757. The reversal of 18204749 is 94740281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10465225 + 7739524 = 3235^2 + 2782^2 .

It is an emirp because it is prime and its reverse (94740281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18204749 - 2⁴ = 18204733 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 (18204743) 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, 9102374 + 9102375.

It is an arithmetic number, because the mean of its divisors is an integer number (9102375).

Almost surely, 2^18204749 is an apocalyptic number.

It is an amenable number.

18204749 is a deficient number, since it is larger than the sum of its proper divisors (1).

18204749 is an equidigital number, since it uses as much as digits as its factorization.

18204749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 18204749 is about 4266.7023566216. The cubic root of 18204749 is about 263.0640882432.

The spelling of 18204749 in words is "eighteen million, two hundred four thousand, seven hundred forty-nine".