986391 has 32 divisors (see below), whose sum is σ = 1774080. Its totient is φ = 528768.

The previous prime is 986369. The next prime is 986411. The reversal of 986391 is 193689.

It is not a de Polignac number, because 986391 - 2¹⁹ = 462103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (986351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3060 + ... + 3366.

It is an arithmetic number, because the mean of its divisors is an integer number (55440).

2⁹⁸⁶³⁹¹ is an apocalyptic number.

986391 is a deficient number, since it is larger than the sum of its proper divisors (787689).

986391 is a wasteful number, since it uses less digits than its factorization.

986391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340 (or 334 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 986391 is about 993.1721905088. The cubic root of 986391 is about 99.5442931337.

The spelling of 986391 in words is "nine hundred eighty-six thousand, three hundred ninety-one".