18958243 has 2 divisors, whose sum is σ = 18958244. Its totient is φ = 18958242.

The previous prime is 18958241. The next prime is 18958271. The reversal of 18958243 is 34285981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18958243 - 2¹ = 18958241 is a prime.

Together with 18958241, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18958196 and 18958205.

It is not a weakly prime, because it can be changed into another prime (18958241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9479121 + 9479122.

It is an arithmetic number, because the mean of its divisors is an integer number (9479122).

Almost surely, 2^18958243 is an apocalyptic number.

18958243 is a deficient number, since it is larger than the sum of its proper divisors (1).

18958243 is an equidigital number, since it uses as much as digits as its factorization.

18958243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 40.

The square root of 18958243 is about 4354.1064525342. The cubic root of 18958243 is about 266.6445400044.

The spelling of 18958243 in words is "eighteen million, nine hundred fifty-eight thousand, two hundred forty-three".