18419243 has 2 divisors, whose sum is σ = 18419244. Its totient is φ = 18419242.

The previous prime is 18419221. The next prime is 18419257. The reversal of 18419243 is 34291481.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18419243 - 2¹⁴ = 18402859 is a prime.

It is equal to p_1176395 and since 18419243 and 1176395 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (18419273) 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, 9209621 + 9209622.

It is an arithmetic number, because the mean of its divisors is an integer number (9209622).

Almost surely, 2^18419243 is an apocalyptic number.

18419243 is a deficient number, since it is larger than the sum of its proper divisors (1).

18419243 is an equidigital number, since it uses as much as digits as its factorization.

18419243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 32.

The square root of 18419243 is about 4291.7645555179. The cubic root of 18419243 is about 264.0932244609.

The spelling of 18419243 in words is "eighteen million, four hundred nineteen thousand, two hundred forty-three".