18268643 has 2 divisors, whose sum is σ = 18268644. Its totient is φ = 18268642.

The previous prime is 18268619. The next prime is 18268661. The reversal of 18268643 is 34686281.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18268643 - 2²² = 14074339 is a prime.

It is a super-2 number, since 2×18268643² = 667486634122898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18268597 and 18268606.

It is not a weakly prime, because it can be changed into another prime (18268603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9134321 + 9134322.

It is an arithmetic number, because the mean of its divisors is an integer number (9134322).

Almost surely, 2^18268643 is an apocalyptic number.

18268643 is a deficient number, since it is larger than the sum of its proper divisors (1).

18268643 is an equidigital number, since it uses as much as digits as its factorization.

18268643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 38.

The square root of 18268643 is about 4274.1833138039. The cubic root of 18268643 is about 263.3714913816.

The spelling of 18268643 in words is "eighteen million, two hundred sixty-eight thousand, six hundred forty-three".