18540343 has 2 divisors, whose sum is σ = 18540344. Its totient is φ = 18540342.

The previous prime is 18540341. The next prime is 18540377. The reversal of 18540343 is 34304581.

It is a weak prime.

It is an emirp because it is prime and its reverse (34304581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18540343 - 2¹ = 18540341 is a prime.

Together with 18540341, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18540341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9270171 + 9270172.

It is an arithmetic number, because the mean of its divisors is an integer number (9270172).

Almost surely, 2^18540343 is an apocalyptic number.

18540343 is a deficient number, since it is larger than the sum of its proper divisors (1).

18540343 is an equidigital number, since it uses as much as digits as its factorization.

18540343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 18540343 is about 4305.8498580420. The cubic root of 18540343 is about 264.6707338070.

The spelling of 18540343 in words is "eighteen million, five hundred forty thousand, three hundred forty-three".