866986818 has 16 divisors (see below), whose sum is σ = 1743054336. Its totient is φ = 287482160.

The previous prime is 866986811. The next prime is 866986819. The reversal of 866986818 is 818689668.

It is a happy number.

866986818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×866986818² = 1503332285171530248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (866986811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 377121 + ... + 379412.

It is an arithmetic number, because the mean of its divisors is an integer number (108940896).

Almost surely, 2^866986818 is an apocalyptic number.

866986818 is an abundant number, since it is smaller than the sum of its proper divisors (876067518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866986818 is a wasteful number, since it uses less digits than its factorization.

866986818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756729.

The product of its digits is 7962624, while the sum is 60.

The square root of 866986818 is about 29444.6398857245. The cubic root of 866986818 is about 953.5368869740.

The spelling of 866986818 in words is "eight hundred sixty-six million, nine hundred eighty-six thousand, eight hundred eighteen".