18046643 has 2 divisors, whose sum is σ = 18046644. Its totient is φ = 18046642.

The previous prime is 18046631. The next prime is 18046661. The reversal of 18046643 is 34664081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18046643 - 2¹² = 18042547 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18046603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9023321 + 9023322.

It is an arithmetic number, because the mean of its divisors is an integer number (9023322).

Almost surely, 2^18046643 is an apocalyptic number.

18046643 is a deficient number, since it is larger than the sum of its proper divisors (1).

18046643 is an equidigital number, since it uses as much as digits as its factorization.

18046643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 18046643 is about 4248.1340609731. The cubic root of 18046643 is about 262.3003131381.

The spelling of 18046643 in words is "eighteen million, forty-six thousand, six hundred forty-three".