866981212 has 6 divisors (see below), whose sum is σ = 1517217128. Its totient is φ = 433490604.

The previous prime is 866981209. The next prime is 866981221. The reversal of 866981212 is 212189668.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108372648 + ... + 108372655.

Almost surely, 2^866981212 is an apocalyptic number.

It is an amenable number.

866981212 is a deficient number, since it is larger than the sum of its proper divisors (650235916).

866981212 is a wasteful number, since it uses less digits than its factorization.

866981212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216745307 (or 216745305 counting only the distinct ones).

The product of its digits is 82944, while the sum is 43.

The square root of 866981212 is about 29444.5446899761. The cubic root of 866981212 is about 953.5348317565.

The spelling of 866981212 in words is "eight hundred sixty-six million, nine hundred eighty-one thousand, two hundred twelve".