209794986 has 12 divisors (see below), whose sum is σ = 454555842. Its totient is φ = 69931656.

The previous prime is 209794951. The next prime is 209794987. The reversal of 209794986 is 689497902.

It can be written as a sum of positive squares in only one way, i.e., 209525625 + 269361 = 14475^2 + 519^2 .

It is not an unprimeable number, because it can be changed into a prime (209794987) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 5827621 + ... + 5827656.

Almost surely, 2^209794986 is an apocalyptic number.

209794986 is an abundant number, since it is smaller than the sum of its proper divisors (244760856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209794986 is a wasteful number, since it uses less digits than its factorization.

209794986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11655285 (or 11655282 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The square root of 209794986 is about 14484.3013638905. The cubic root of 209794986 is about 594.1987057554.

The spelling of 209794986 in words is "two hundred nine million, seven hundred ninety-four thousand, nine hundred eighty-six".