22749 has 4 divisors (see below), whose sum is σ = 30336. Its totient is φ = 15164.

The previous prime is 22741. The next prime is 22751. The reversal of 22749 is 94722.

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 a cyclic number.

It is not a de Polignac number, because 22749 - 2³ = 22741 is a prime.

It is a D-number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3789 + ... + 3794.

It is an arithmetic number, because the mean of its divisors is an integer number (7584).

2²²⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

22749 is a deficient number, since it is larger than the sum of its proper divisors (7587).

22749 is an equidigital number, since it uses as much as digits as its factorization.

22749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7586.

The product of its digits is 1008, while the sum is 24.

The square root of 22749 is about 150.8277162858. The cubic root of 22749 is about 28.3348403658.

It can be divided in two parts, 227 and 49, that added together give a triangular number (276 = T₂₃).

The spelling of 22749 in words is "twenty-two thousand, seven hundred forty-nine".