18034643 has 4 divisors (see below), whose sum is σ = 19674168. Its totient is φ = 16395120.

The previous prime is 18034633. The next prime is 18034649. The reversal of 18034643 is 34643081.

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 18034643 - 2²² = 13840339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18034649) 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, 819746 + ... + 819767.

It is an arithmetic number, because the mean of its divisors is an integer number (4918542).

Almost surely, 2^18034643 is an apocalyptic number.

18034643 is a deficient number, since it is larger than the sum of its proper divisors (1639525).

18034643 is a wasteful number, since it uses less digits than its factorization.

18034643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1639524.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 18034643 is about 4246.7214413003. The cubic root of 18034643 is about 262.2421619412.

It can be divided in two parts, 1803 and 4643, that added together give a palindrome (6446).

The spelling of 18034643 in words is "eighteen million, thirty-four thousand, six hundred forty-three".