18200449 has 2 divisors, whose sum is σ = 18200450. Its totient is φ = 18200448.

The previous prime is 18200447. The next prime is 18200453. The reversal of 18200449 is 94400281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18122049 + 78400 = 4257^2 + 280^2 .

It is a cyclic number.

It is not a de Polignac number, because 18200449 - 2¹ = 18200447 is a prime.

Together with 18200447, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18200443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9100224 + 9100225.

It is an arithmetic number, because the mean of its divisors is an integer number (9100225).

Almost surely, 2^18200449 is an apocalyptic number.

It is an amenable number.

18200449 is a deficient number, since it is larger than the sum of its proper divisors (1).

18200449 is an equidigital number, since it uses as much as digits as its factorization.

18200449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 18200449 is about 4266.1984248274. The cubic root of 18200449 is about 263.0433745152.

The spelling of 18200449 in words is "eighteen million, two hundred thousand, four hundred forty-nine".