223203989 has 2 divisors, whose sum is σ = 223203990. Its totient is φ = 223203988.

The previous prime is 223203977. The next prime is 223203991. The reversal of 223203989 is 989302322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186540964 + 36663025 = 13658^2 + 6055^2 .

It is a cyclic number.

It is not a de Polignac number, because 223203989 - 2⁴ = 223203973 is a prime.

It is a super-3 number, since 3×223203989³ (a number of 26 digits) contains 333 as substring.

It is a Sophie Germain prime.

Together with 223203991, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223202989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111601994 + 111601995.

It is an arithmetic number, because the mean of its divisors is an integer number (111601995).

Almost surely, 2^223203989 is an apocalyptic number.

It is an amenable number.

223203989 is a deficient number, since it is larger than the sum of its proper divisors (1).

223203989 is an equidigital number, since it uses as much as digits as its factorization.

223203989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 223203989 is about 14940.0130187360. The cubic root of 223203989 is about 606.5975482111.

The spelling of 223203989 in words is "two hundred twenty-three million, two hundred three thousand, nine hundred eighty-nine".