9861986 has 8 divisors (see below), whose sum is σ = 15436224. Its totient is φ = 4716580.

The previous prime is 9861983. The next prime is 9861991. The reversal of 9861986 is 6891689.

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

9861986 is a strobogrammatic number because it is the same when read upside-down.

It is a self number, because there is not a number n which added to its sum of digits gives 9861986.

It is not an unprimeable number, because it can be changed into a prime (9861983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107150 + ... + 107241.

It is an arithmetic number, because the mean of its divisors is an integer number (1929528).

Almost surely, 2^9861986 is an apocalyptic number.

9861986 is a deficient number, since it is larger than the sum of its proper divisors (5574238).

9861986 is a wasteful number, since it uses less digits than its factorization.

9861986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214416.

The product of its digits is 186624, while the sum is 47.

The square root of 9861986 is about 3140.3799133226. The cubic root of 9861986 is about 214.4477335104.

The spelling of 9861986 in words is "nine million, eight hundred sixty-one thousand, nine hundred eighty-six".