18398273 has 2 divisors, whose sum is σ = 18398274. Its totient is φ = 18398272.

The previous prime is 18398257. The next prime is 18398279. The reversal of 18398273 is 37289381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9535744 + 8862529 = 3088^2 + 2977^2 .

It is a cyclic number.

It is not a de Polignac number, because 18398273 - 2⁴ = 18398257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18398273.

It is not a weakly prime, because it can be changed into another prime (18398279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9199136 + 9199137.

It is an arithmetic number, because the mean of its divisors is an integer number (9199137).

Almost surely, 2^18398273 is an apocalyptic number.

It is an amenable number.

18398273 is a deficient number, since it is larger than the sum of its proper divisors (1).

18398273 is an equidigital number, since it uses as much as digits as its factorization.

18398273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 41.

The square root of 18398273 is about 4289.3208087062. The cubic root of 18398273 is about 263.9929644972.

The spelling of 18398273 in words is "eighteen million, three hundred ninety-eight thousand, two hundred seventy-three".