18704249 has 2 divisors, whose sum is σ = 18704250. Its totient is φ = 18704248.

The previous prime is 18704243. The next prime is 18704263. The reversal of 18704249 is 94240781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14684224 + 4020025 = 3832^2 + 2005^2 .

It is a cyclic number.

It is not a de Polignac number, because 18704249 - 2²⁴ = 1927033 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18704243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9352124 + 9352125.

It is an arithmetic number, because the mean of its divisors is an integer number (9352125).

Almost surely, 2^18704249 is an apocalyptic number.

It is an amenable number.

18704249 is a deficient number, since it is larger than the sum of its proper divisors (1).

18704249 is an equidigital number, since it uses as much as digits as its factorization.

18704249 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 18704249 is about 4324.8409219300. The cubic root of 18704249 is about 265.4483876772.

The spelling of 18704249 in words is "eighteen million, seven hundred four thousand, two hundred forty-nine".