18496643 has 4 divisors (see below), whose sum is σ = 20178168. Its totient is φ = 16815120.

The previous prime is 18496619. The next prime is 18496649. The reversal of 18496643 is 34669481.

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 18496643 - 2¹⁸ = 18234499 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18496643.

It is not an unprimeable number, because it can be changed into a prime (18496649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 840746 + ... + 840767.

It is an arithmetic number, because the mean of its divisors is an integer number (5044542).

Almost surely, 2^18496643 is an apocalyptic number.

18496643 is a deficient number, since it is larger than the sum of its proper divisors (1681525).

18496643 is a wasteful number, since it uses less digits than its factorization.

18496643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1681524.

The product of its digits is 124416, while the sum is 41.

The square root of 18496643 is about 4300.7723724931. The cubic root of 18496643 is about 264.4626252843.

The spelling of 18496643 in words is "eighteen million, four hundred ninety-six thousand, six hundred forty-three".