18642223 has 2 divisors, whose sum is σ = 18642224. Its totient is φ = 18642222.

The previous prime is 18642199. The next prime is 18642227. The reversal of 18642223 is 32224681.

It is a strong prime.

It is an emirp because it is prime and its reverse (32224681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18642223 - 2²¹ = 16545071 is a prime.

It is a super-3 number, since 3×18642223³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18642191 and 18642200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18642227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9321111 + 9321112.

It is an arithmetic number, because the mean of its divisors is an integer number (9321112).

Almost surely, 2^18642223 is an apocalyptic number.

18642223 is a deficient number, since it is larger than the sum of its proper divisors (1).

18642223 is an equidigital number, since it uses as much as digits as its factorization.

18642223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 28.

The square root of 18642223 is about 4317.6640675254. The cubic root of 18642223 is about 265.1546409627.

The spelling of 18642223 in words is "eighteen million, six hundred forty-two thousand, two hundred twenty-three".