18237449 has 2 divisors, whose sum is σ = 18237450. Its totient is φ = 18237448.

The previous prime is 18237421. The next prime is 18237463. The reversal of 18237449 is 94473281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14684224 + 3553225 = 3832^2 + 1885^2 .

It is a cyclic number.

It is not a de Polignac number, because 18237449 - 2²⁴ = 1460233 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 (18237419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9118724 + 9118725.

It is an arithmetic number, because the mean of its divisors is an integer number (9118725).

Almost surely, 2^18237449 is an apocalyptic number.

It is an amenable number.

18237449 is a deficient number, since it is larger than the sum of its proper divisors (1).

18237449 is an equidigital number, since it uses as much as digits as its factorization.

18237449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 38.

The square root of 18237449 is about 4270.5326365689. The cubic root of 18237449 is about 263.2215023022.

The spelling of 18237449 in words is "eighteen million, two hundred thirty-seven thousand, four hundred forty-nine".