18448273 has 2 divisors, whose sum is σ = 18448274. Its totient is φ = 18448272.

The previous prime is 18448271. The next prime is 18448279. The reversal of 18448273 is 37284481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17918289 + 529984 = 4233^2 + 728^2 .

It is a cyclic number.

It is not a de Polignac number, because 18448273 - 2¹ = 18448271 is a prime.

Together with 18448271, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18448271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9224136 + 9224137.

It is an arithmetic number, because the mean of its divisors is an integer number (9224137).

Almost surely, 2^18448273 is an apocalyptic number.

It is an amenable number.

18448273 is a deficient number, since it is larger than the sum of its proper divisors (1).

18448273 is an equidigital number, since it uses as much as digits as its factorization.

18448273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43008, while the sum is 37.

The square root of 18448273 is about 4295.1452827582. The cubic root of 18448273 is about 264.2318946932.

It can be divided in two parts, 18448 and 273, that added together give a triangular number (18721 = T₁₉₃).

The spelling of 18448273 in words is "eighteen million, four hundred forty-eight thousand, two hundred seventy-three".