985791 has 16 divisors (see below), whose sum is σ = 1378944. Its totient is φ = 625824.

The previous prime is 985783. The next prime is 985799. The reversal of 985791 is 197589.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (985783) and next prime (985799).

It is not a de Polignac number, because 985791 - 2³ = 985783 is a prime.

It is an Ulam number.

985791 is a lucky number.

It is a zygodrome in base 4.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 985791.

It is not an unprimeable number, because it can be changed into a prime (985799) 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 15 ways as a sum of consecutive naturals, for example, 9160 + ... + 9266.

It is an arithmetic number, because the mean of its divisors is an integer number (86184).

2⁹⁸⁵⁷⁹¹ is an apocalyptic number.

985791 is a deficient number, since it is larger than the sum of its proper divisors (393153).

985791 is a wasteful number, since it uses less digits than its factorization.

985791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230.

The product of its digits is 22680, while the sum is 39.

The square root of 985791 is about 992.8700821356. The cubic root of 985791 is about 99.5241055036.

The spelling of 985791 in words is "nine hundred eighty-five thousand, seven hundred ninety-one".