9881986 has 8 divisors (see below), whose sum is σ = 14900364. Its totient is φ = 4915200.

The previous prime is 9881983. The next prime is 9881987. The reversal of 9881986 is 6891889.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9272025 + 609961 = 3045^2 + 781^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9881983) 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, 12415 + ... + 13186.

Almost surely, 2^9881986 is an apocalyptic number.

9881986 is a deficient number, since it is larger than the sum of its proper divisors (5018378).

9881986 is a wasteful number, since it uses less digits than its factorization.

9881986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25796.

The product of its digits is 248832, while the sum is 49.

The square root of 9881986 is about 3143.5626286110. The cubic root of 9881986 is about 214.5926015121.

The spelling of 9881986 in words is "nine million, eight hundred eighty-one thousand, nine hundred eighty-six".