16864866 has 12 divisors (see below), whose sum is σ = 36540582. Its totient is φ = 5621616.

The previous prime is 16864847. The next prime is 16864873. The reversal of 16864866 is 66846861.

16864866 is a `hidden beast` number, since 168 + 6 + 486 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16232841 + 632025 = 4029^2 + 795^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 468451 + ... + 468486.

Almost surely, 2^16864866 is an apocalyptic number.

16864866 is an abundant number, since it is smaller than the sum of its proper divisors (19675716).

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

16864866 is a wasteful number, since it uses less digits than its factorization.

16864866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936945 (or 936942 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 16864866 is about 4106.6855248485. The cubic root of 16864866 is about 256.4450368422.

The spelling of 16864866 in words is "sixteen million, eight hundred sixty-four thousand, eight hundred sixty-six".