18112643 has 4 divisors (see below), whose sum is σ = 19065960. Its totient is φ = 17159328.

The previous prime is 18112637. The next prime is 18112663. The reversal of 18112643 is 34621181.

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

It is a cyclic number.

It is not a de Polignac number, because 18112643 - 2⁸ = 18112387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18112663) 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, 476630 + ... + 476667.

It is an arithmetic number, because the mean of its divisors is an integer number (4766490).

Almost surely, 2^18112643 is an apocalyptic number.

18112643 is a deficient number, since it is larger than the sum of its proper divisors (953317).

18112643 is an equidigital number, since it uses as much as digits as its factorization.

18112643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953316.

The product of its digits is 1152, while the sum is 26.

The square root of 18112643 is about 4255.8950879927. The cubic root of 18112643 is about 262.6196848026.

The spelling of 18112643 in words is "eighteen million, one hundred twelve thousand, six hundred forty-three".