209934445 has 16 divisors (see below), whose sum is σ = 304846848. Its totient is φ = 135486720.

The previous prime is 209934437. The next prime is 209934457. The reversal of 209934445 is 544439902.

It is not a de Polignac number, because 209934445 - 2³ = 209934437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 209934398 and 209934407.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175821 + ... + 177010.

It is an arithmetic number, because the mean of its divisors is an integer number (19052928).

Almost surely, 2^209934445 is an apocalyptic number.

It is an amenable number.

209934445 is a deficient number, since it is larger than the sum of its proper divisors (94912403).

209934445 is a wasteful number, since it uses less digits than its factorization.

209934445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352860.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 209934445 is about 14489.1147072552. The cubic root of 209934445 is about 594.3303390293.

The spelling of 209934445 in words is "two hundred nine million, nine hundred thirty-four thousand, four hundred forty-five".