209686012 has 12 divisors (see below), whose sum is σ = 368814600. Its totient is φ = 104310416.

The previous prime is 209685997. The next prime is 209686019. The reversal of 209686012 is 210686902.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209686019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132262 + ... + 133837.

It is an arithmetic number, because the mean of its divisors is an integer number (30734550).

Almost surely, 2^209686012 is an apocalyptic number.

It is an amenable number.

209686012 is a deficient number, since it is larger than the sum of its proper divisors (159128588).

209686012 is a wasteful number, since it uses less digits than its factorization.

209686012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266300 (or 266298 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 209686012 is about 14480.5390783631. The cubic root of 209686012 is about 594.0958062126.

The spelling of 209686012 in words is "two hundred nine million, six hundred eighty-six thousand, twelve".