18299273 has 2 divisors, whose sum is σ = 18299274. Its totient is φ = 18299272.

The previous prime is 18299249. The next prime is 18299279. The reversal of 18299273 is 37299281.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13227769 + 5071504 = 3637^2 + 2252^2 .

It is an emirp because it is prime and its reverse (37299281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18299273 - 2²⁴ = 1522057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18299273.

It is not a weakly prime, because it can be changed into another prime (18299279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9149636 + 9149637.

It is an arithmetic number, because the mean of its divisors is an integer number (9149637).

Almost surely, 2^18299273 is an apocalyptic number.

It is an amenable number.

18299273 is a deficient number, since it is larger than the sum of its proper divisors (1).

18299273 is an equidigital number, since it uses as much as digits as its factorization.

18299273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 41.

The square root of 18299273 is about 4277.7649538047. The cubic root of 18299273 is about 263.5186025535.

The spelling of 18299273 in words is "eighteen million, two hundred ninety-nine thousand, two hundred seventy-three".