18038643 has 16 divisors (see below), whose sum is σ = 27565056. Its totient is φ = 10278720.

The previous prime is 18038597. The next prime is 18038651. The reversal of 18038643 is 34683081.

It is not a de Polignac number, because 18038643 - 2⁹ = 18038131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18038663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8055 + ... + 10047.

It is an arithmetic number, because the mean of its divisors is an integer number (1722816).

Almost surely, 2^18038643 is an apocalyptic number.

18038643 is a deficient number, since it is larger than the sum of its proper divisors (9526413).

18038643 is a wasteful number, since it uses less digits than its factorization.

18038643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2434.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 18038643 is about 4247.1923667289. The cubic root of 18038643 is about 262.2615485389.

It can be divided in two parts, 18038 and 643, that added together give a palindrome (18681).

The spelling of 18038643 in words is "eighteen million, thirty-eight thousand, six hundred forty-three".