18723849 has 8 divisors (see below), whose sum is σ = 25131072. Its totient is φ = 12399600.

The previous prime is 18723833. The next prime is 18723871. The reversal of 18723849 is 94832781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18723849 - 2⁴ = 18723833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18723849.

It is not an unprimeable number, because it can be changed into a prime (18723829) 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 7 ways as a sum of consecutive naturals, for example, 20214 + ... + 21119.

It is an arithmetic number, because the mean of its divisors is an integer number (3141384).

Almost surely, 2^18723849 is an apocalyptic number.

It is an amenable number.

18723849 is a deficient number, since it is larger than the sum of its proper divisors (6407223).

18723849 is a wasteful number, since it uses less digits than its factorization.

18723849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41487.

The product of its digits is 96768, while the sum is 42.

The square root of 18723849 is about 4327.1063079153. The cubic root of 18723849 is about 265.5410755675.

The spelling of 18723849 in words is "eighteen million, seven hundred twenty-three thousand, eight hundred forty-nine".