869986 has 8 divisors (see below), whose sum is σ = 1405404. Its totient is φ = 401520.

The previous prime is 869983. The next prime is 869989. The reversal of 869986 is 689968.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (869983) and next prime (869989).

It can be written as a sum of positive squares in 2 ways, for example, as 837225 + 32761 = 915^2 + 181^2 .

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 (869983) 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, 16705 + ... + 16756.

2⁸⁶⁹⁹⁸⁶ is an apocalyptic number.

869986 is a deficient number, since it is larger than the sum of its proper divisors (535418).

869986 is a wasteful number, since it uses less digits than its factorization.

869986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33476.

The product of its digits is 186624, while the sum is 46.

The square root of 869986 is about 932.7304004909. The cubic root of 869986 is about 95.4635150233.

The spelling of 869986 in words is "eight hundred sixty-nine thousand, nine hundred eighty-six".