866906 has 4 divisors (see below), whose sum is σ = 1300362. Its totient is φ = 433452.

The previous prime is 866869. The next prime is 866909. The reversal of 866906 is 609668.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 714025 + 152881 = 845^2 + 391^2 .

It is not an unprimeable number, because it can be changed into a prime (866909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216725 + ... + 216728.

2⁸⁶⁶⁹⁰⁶ is an apocalyptic number.

866906 is a deficient number, since it is larger than the sum of its proper divisors (433456).

866906 is a wasteful number, since it uses less digits than its factorization.

866906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433455.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 866906 is about 931.0778699980. The cubic root of 866906 is about 95.3507257404.

The spelling of 866906 in words is "eight hundred sixty-six thousand, nine hundred six".