223999999 has 4 divisors (see below), whose sum is σ = 224363664. Its totient is φ = 223636336.

The previous prime is 223999903. The next prime is 224000047. The reversal of 223999999 is 999999322.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223999999 is a prime.

It is a Duffinian number.

223999999 is a modest number, since divided by 99999 gives 2239 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223999099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180907 + ... + 182140.

It is an arithmetic number, because the mean of its divisors is an integer number (56090916).

Almost surely, 2^223999999 is an apocalyptic number.

223999999 is a deficient number, since it is larger than the sum of its proper divisors (363665).

223999999 is an equidigital number, since it uses as much as digits as its factorization.

223999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363664.

The product of its digits is 6377292, while the sum is 61.

The square root of 223999999 is about 14966.6295136881. The cubic root of 223999999 is about 607.3177934714.

It can be divided in two parts, 22 and 3999999, that multiplied together give a palindrome (87999978).

The spelling of 223999999 in words is "two hundred twenty-three million, nine hundred ninety-nine thousand, nine hundred ninety-nine".