869866 has 4 divisors (see below), whose sum is σ = 1304802. Its totient is φ = 434932.

The previous prime is 869863. The next prime is 869879. The reversal of 869866 is 668968.

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., 648025 + 221841 = 805^2 + 471^2 .

It is not an unprimeable number, because it can be changed into a prime (869863) 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, 217465 + ... + 217468.

2⁸⁶⁹⁸⁶⁶ is an apocalyptic number.

869866 is a deficient number, since it is larger than the sum of its proper divisors (434936).

869866 is a wasteful number, since it uses less digits than its factorization.

869866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434935.

The product of its digits is 124416, while the sum is 43.

The square root of 869866 is about 932.6660710029. Note that the first 3 decimals coincide. The cubic root of 869866 is about 95.4591256237.

The spelling of 869866 in words is "eight hundred sixty-nine thousand, eight hundred sixty-six".