18244749 has 4 divisors (see below), whose sum is σ = 24326336. Its totient is φ = 12163164.

The previous prime is 18244729. The next prime is 18244777. The reversal of 18244749 is 94744281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18244749 - 2¹¹ = 18242701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18244729) 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, 3040789 + ... + 3040794.

It is an arithmetic number, because the mean of its divisors is an integer number (6081584).

Almost surely, 2^18244749 is an apocalyptic number.

It is an amenable number.

18244749 is a deficient number, since it is larger than the sum of its proper divisors (6081587).

18244749 is an equidigital number, since it uses as much as digits as its factorization.

18244749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6081586.

The product of its digits is 64512, while the sum is 39.

The square root of 18244749 is about 4271.3872453806. The cubic root of 18244749 is about 263.2566179707.

The spelling of 18244749 in words is "eighteen million, two hundred forty-four thousand, seven hundred forty-nine".