209475445 has 24 divisors (see below), whose sum is σ = 269924616. Its totient is φ = 155516928.

The previous prime is 209475407. The next prime is 209475499. The reversal of 209475445 is 544574902.

It can be written as a sum of positive squares in 12 ways, for example, as 166978084 + 42497361 = 12922^2 + 6519^2 .

It is not a de Polignac number, because 209475445 - 2²⁷ = 75257717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 209475398 and 209475407.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1085269 + ... + 1085461.

It is an arithmetic number, because the mean of its divisors is an integer number (11246859).

Almost surely, 2^209475445 is an apocalyptic number.

It is an amenable number.

209475445 is a deficient number, since it is larger than the sum of its proper divisors (60449171).

209475445 is a wasteful number, since it uses less digits than its factorization.

209475445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 40.

The square root of 209475445 is about 14473.2665628738. The cubic root of 209475445 is about 593.8968756497.

The spelling of 209475445 in words is "two hundred nine million, four hundred seventy-five thousand, four hundred forty-five".