840866 has 8 divisors (see below), whose sum is σ = 1358364. Its totient is φ = 388080.

The previous prime is 840863. The next prime is 840907. The reversal of 840866 is 668048.

It can be written as a sum of positive squares in 2 ways, for example, as 697225 + 143641 = 835^2 + 379^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (840863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16145 + ... + 16196.

2⁸⁴⁰⁸⁶⁶ is an apocalyptic number.

840866 is a deficient number, since it is larger than the sum of its proper divisors (517498).

840866 is a wasteful number, since it uses less digits than its factorization.

840866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32356.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 840866 is about 916.9874590200. The cubic root of 840866 is about 94.3862932555.

The spelling of 840866 in words is "eight hundred forty thousand, eight hundred sixty-six".