18842649 has 8 divisors (see below), whose sum is σ = 28712640. Its totient is φ = 10767216.

The previous prime is 18842639. The next prime is 18842651. The reversal of 18842649 is 94624881.

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

It is not a de Polignac number, because 18842649 - 2⁴ = 18842633 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18842649.

It is not an unprimeable number, because it can be changed into a prime (18842639) 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, 448614 + ... + 448655.

It is an arithmetic number, because the mean of its divisors is an integer number (3589080).

Almost surely, 2^18842649 is an apocalyptic number.

It is an amenable number.

18842649 is a deficient number, since it is larger than the sum of its proper divisors (9869991).

18842649 is an equidigital number, since it uses as much as digits as its factorization.

18842649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897279.

The product of its digits is 110592, while the sum is 42.

The square root of 18842649 is about 4340.8120208090. The cubic root of 18842649 is about 266.1014980029.

It can be divided in two parts, 18842 and 649, that added together give a palindrome (19491).

The spelling of 18842649 in words is "eighteen million, eight hundred forty-two thousand, six hundred forty-nine".