981686 has 8 divisors (see below), whose sum is σ = 1536624. Its totient is φ = 469480.

The previous prime is 981683. The next prime is 981691. The reversal of 981686 is 686189.

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 (981683) 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, 10625 + ... + 10716.

It is an arithmetic number, because the mean of its divisors is an integer number (192078).

2⁹⁸¹⁶⁸⁶ is an apocalyptic number.

981686 is a deficient number, since it is larger than the sum of its proper divisors (554938).

981686 is a wasteful number, since it uses less digits than its factorization.

981686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21366.

The product of its digits is 20736, while the sum is 38.

The square root of 981686 is about 990.8006863139. The cubic root of 981686 is about 99.3857682515.

The spelling of 981686 in words is "nine hundred eighty-one thousand, six hundred eighty-six".