209734066 has 8 divisors (see below), whose sum is σ = 333107100. Its totient is φ = 98698368.

The previous prime is 209734051. The next prime is 209734067. The reversal of 209734066 is 660437902.

It can be written as a sum of positive squares in 2 ways, for example, as 204347025 + 5387041 = 14295^2 + 2321^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (209734067) 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, 3084291 + ... + 3084358.

Almost surely, 2^209734066 is an apocalyptic number.

209734066 is a deficient number, since it is larger than the sum of its proper divisors (123373034).

209734066 is a wasteful number, since it uses less digits than its factorization.

209734066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6168668.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 209734066 is about 14482.1982447417. The cubic root of 209734066 is about 594.1411859672.

It can be divided in two parts, 2097 and 34066, that added together give a palindrome (36163).

The spelling of 209734066 in words is "two hundred nine million, seven hundred thirty-four thousand, sixty-six".