18222943 has 2 divisors, whose sum is σ = 18222944. Its totient is φ = 18222942.

The previous prime is 18222913. The next prime is 18222949. The reversal of 18222943 is 34922281.

It is a strong prime.

It is an emirp because it is prime and its reverse (34922281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18222943 - 2⁹ = 18222431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18222949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9111471 + 9111472.

It is an arithmetic number, because the mean of its divisors is an integer number (9111472).

Almost surely, 2^18222943 is an apocalyptic number.

18222943 is a deficient number, since it is larger than the sum of its proper divisors (1).

18222943 is an equidigital number, since it uses as much as digits as its factorization.

18222943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 31.

The square root of 18222943 is about 4268.8339157198. The cubic root of 18222943 is about 263.1516953185.

The spelling of 18222943 in words is "eighteen million, two hundred twenty-two thousand, nine hundred forty-three".