209915012 has 12 divisors (see below), whose sum is σ = 379201536. Its totient is φ = 101571720.

The previous prime is 209915009. The next prime is 209915053. The reversal of 209915012 is 210519902.

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, 846308 + ... + 846555.

It is an arithmetic number, because the mean of its divisors is an integer number (31600128).

Almost surely, 2^209915012 is an apocalyptic number.

It is an amenable number.

209915012 is a deficient number, since it is larger than the sum of its proper divisors (169286524).

209915012 is a wasteful number, since it uses less digits than its factorization.

209915012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1692898 (or 1692896 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 209915012 is about 14488.4440848560. Note that the first 3 decimals coincide. The cubic root of 209915012 is about 594.3120000062.

The spelling of 209915012 in words is "two hundred nine million, nine hundred fifteen thousand, twelve".