18064643 has 4 divisors (see below), whose sum is σ = 18083760. Its totient is φ = 18045528.

The previous prime is 18064619. The next prime is 18064663. The reversal of 18064643 is 34646081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18064643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18064603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8063 + ... + 10056.

It is an arithmetic number, because the mean of its divisors is an integer number (4520940).

Almost surely, 2^18064643 is an apocalyptic number.

18064643 is a deficient number, since it is larger than the sum of its proper divisors (19117).

18064643 is an equidigital number, since it uses as much as digits as its factorization.

18064643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19116.

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

The square root of 18064643 is about 4250.2521101695. The cubic root of 18064643 is about 262.3874916191.

The spelling of 18064643 in words is "eighteen million, sixty-four thousand, six hundred forty-three".