223720173 has 6 divisors (see below), whose sum is σ = 323151374. Its totient is φ = 149146776.

The previous prime is 223720157. The next prime is 223720177. The reversal of 223720173 is 371027322.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 194267844 + 29452329 = 13938^2 + 5427^2 .

It is not a de Polignac number, because 223720173 - 2⁴ = 223720157 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 (223720177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12428890 + ... + 12428907.

Almost surely, 2^223720173 is an apocalyptic number.

It is an amenable number.

223720173 is a deficient number, since it is larger than the sum of its proper divisors (99431201).

223720173 is a wasteful number, since it uses less digits than its factorization.

223720173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24857803 (or 24857800 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 223720173 is about 14957.2782617694. The cubic root of 223720173 is about 607.0647962623.

Adding to 223720173 its reverse (371027322), we get a palindrome (594747495).

The spelling of 223720173 in words is "two hundred twenty-three million, seven hundred twenty thousand, one hundred seventy-three".