223730 has 16 divisors (see below), whose sum is σ = 433944. Its totient is φ = 82560.

The previous prime is 223711. The next prime is 223747. The reversal of 223730 is 37322.

223730 = 131² + 132² + ... + 142².

It is a Cunningham number, because it is equal to 473²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 165649 + 58081 = 407^2 + 241^2 .

It is a super-2 number, since 2×223730² = 100110225800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 223699 and 223708.

It is an unprimeable number.

223730 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 731 + ... + 990.

2²²³⁷³⁰ is an apocalyptic number.

223730 is a deficient number, since it is larger than the sum of its proper divisors (210214).

223730 is a wasteful number, since it uses less digits than its factorization.

223730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1741.

The product of its (nonzero) digits is 252, while the sum is 17.

The square root of 223730 is about 473.0010570813. The cubic root of 223730 is about 60.7073684655.

It can be divided in two parts, 2 and 23730, that added together give a palindrome (23732).

The spelling of 223730 in words is "two hundred twenty-three thousand, seven hundred thirty".