209990012 has 12 divisors (see below), whose sum is σ = 369824280. Its totient is φ = 104325936.

The previous prime is 209990003. The next prime is 209990029. The reversal of 209990012 is 210099902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166562 + ... + 167817.

It is an arithmetic number, because the mean of its divisors is an integer number (30818690).

Almost surely, 2^209990012 is an apocalyptic number.

It is an amenable number.

209990012 is a deficient number, since it is larger than the sum of its proper divisors (159834268).

209990012 is a wasteful number, since it uses less digits than its factorization.

209990012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334540 (or 334538 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 209990012 is about 14491.0321233513. The cubic root of 209990012 is about 594.3827716519.

The spelling of 209990012 in words is "two hundred nine million, nine hundred ninety thousand, twelve".