18822729 has 8 divisors (see below), whose sum is σ = 25168320. Its totient is φ = 12512816.

The previous prime is 18822721. The next prime is 18822743. The reversal of 18822729 is 92722881.

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

It is a cyclic number.

It is not a de Polignac number, because 18822729 - 2³ = 18822721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18822721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7662 + ... + 9815.

It is an arithmetic number, because the mean of its divisors is an integer number (3146040).

Almost surely, 2^18822729 is an apocalyptic number.

It is an amenable number.

18822729 is a deficient number, since it is larger than the sum of its proper divisors (6345591).

18822729 is a wasteful number, since it uses less digits than its factorization.

18822729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17839.

The product of its digits is 32256, while the sum is 39.

The square root of 18822729 is about 4338.5169124944. The cubic root of 18822729 is about 266.0076928825.

The spelling of 18822729 in words is "eighteen million, eight hundred twenty-two thousand, seven hundred twenty-nine".