223739 has 4 divisors (see below), whose sum is σ = 229824. Its totient is φ = 217656.

The previous prime is 223711. The next prime is 223747. The reversal of 223739 is 937322.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 937322 = 2 ⋅468661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (223759) 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 3 ways as a sum of consecutive naturals, for example, 2987 + ... + 3060.

It is an arithmetic number, because the mean of its divisors is an integer number (57456).

2²²³⁷³⁹ is an apocalyptic number.

223739 is a deficient number, since it is larger than the sum of its proper divisors (6085).

223739 is an equidigital number, since it uses as much as digits as its factorization.

223739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6084.

The product of its digits is 2268, while the sum is 26.

The square root of 223739 is about 473.0105707064. The cubic root of 223739 is about 60.7081824809.

The spelling of 223739 in words is "two hundred twenty-three thousand, seven hundred thirty-nine".