986991 has 8 divisors (see below), whose sum is σ = 1320960. Its totient is φ = 655512.

The previous prime is 986989. The next prime is 987013. The reversal of 986991 is 199689.

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

It is not a de Polignac number, because 986991 - 2¹ = 986989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (986941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 720 + ... + 1578.

It is an arithmetic number, because the mean of its divisors is an integer number (165120).

2⁹⁸⁶⁹⁹¹ is an apocalyptic number.

986991 is a deficient number, since it is larger than the sum of its proper divisors (333969).

986991 is a wasteful number, since it uses less digits than its factorization.

986991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245.

The product of its digits is 34992, while the sum is 42.

The square root of 986991 is about 993.4742070129. The cubic root of 986991 is about 99.5644725791.

The spelling of 986991 in words is "nine hundred eighty-six thousand, nine hundred ninety-one".