209223968 has 18 divisors (see below), whose sum is σ = 412070841. Its totient is φ = 104571072.

The previous prime is 209223901. The next prime is 209224021. The reversal of 209223968 is 869322902.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 208167184 + 1056784 = 14428^2 + 1028^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=10228.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 80546 + ... + 83102.

Almost surely, 2^209223968 is an apocalyptic number.

It is an amenable number.

209223968 is a deficient number, since it is larger than the sum of its proper divisors (202846873).

209223968 is an frugal number, since it uses more digits than its factorization.

209223968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5124 (or 2559 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 209223968 is about 14464.5763159520. The cubic root of 209223968 is about 593.6591211158.

Multiplying 209223968 by its product of nonzero digits (93312), we get a square (19523106902016 = 4418496²).

The spelling of 209223968 in words is "two hundred nine million, two hundred twenty-three thousand, nine hundred sixty-eight".