209867085 has 32 divisors (see below), whose sum is σ = 373714560. Its totient is φ = 111744000.

The previous prime is 209867083. The next prime is 209867089. The reversal of 209867085 is 580768902.

It is not a de Polignac number, because 209867085 - 2¹ = 209867083 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 209867085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209867083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130285 + ... + 131885.

It is an arithmetic number, because the mean of its divisors is an integer number (11678580).

Almost surely, 2^209867085 is an apocalyptic number.

It is an amenable number.

209867085 is a deficient number, since it is larger than the sum of its proper divisors (163847475).

209867085 is a wasteful number, since it uses less digits than its factorization.

209867085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2586 (or 2580 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 209867085 is about 14486.7900171156. The cubic root of 209867085 is about 594.2667662090.

The spelling of 209867085 in words is "two hundred nine million, eight hundred sixty-seven thousand, eighty-five".