18993343 has 2 divisors, whose sum is σ = 18993344. Its totient is φ = 18993342.

The previous prime is 18993341. The next prime is 18993367. The reversal of 18993343 is 34339981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18993343 - 2¹ = 18993341 is a prime.

Together with 18993341, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18993296 and 18993305.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18993341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9496671 + 9496672.

It is an arithmetic number, because the mean of its divisors is an integer number (9496672).

Almost surely, 2^18993343 is an apocalyptic number.

18993343 is a deficient number, since it is larger than the sum of its proper divisors (1).

18993343 is an equidigital number, since it uses as much as digits as its factorization.

18993343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 40.

The square root of 18993343 is about 4358.1352663725. The cubic root of 18993343 is about 266.8089971094.

The spelling of 18993343 in words is "eighteen million, nine hundred ninety-three thousand, three hundred forty-three".