223749 has 8 divisors (see below), whose sum is σ = 331520. Its totient is φ = 149148.

The previous prime is 223747. The next prime is 223753. The reversal of 223749 is 947322.

It is not a de Polignac number, because 223749 - 2¹ = 223747 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 8287 = 223749 / (2 + 2 + 3 + 7 + 4 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4117 + ... + 4170.

It is an arithmetic number, because the mean of its divisors is an integer number (41440).

2²²³⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

223749 is a deficient number, since it is larger than the sum of its proper divisors (107771).

223749 is an equidigital number, since it uses as much as digits as its factorization.

223749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8296 (or 8290 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 223749 is about 473.0211411766. The cubic root of 223749 is about 60.7090869169.

The spelling of 223749 in words is "two hundred twenty-three thousand, seven hundred forty-nine".