923891 has 4 divisors (see below), whose sum is σ = 928872. Its totient is φ = 918912.

The previous prime is 923869. The next prime is 923903. The reversal of 923891 is 198329.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198329 = 23 ⋅8623.

It is a cyclic number.

It is not a de Polignac number, because 923891 - 2¹⁴ = 907507 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 923891.

It is not an unprimeable number, because it can be changed into a prime (923851) 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 3 ways as a sum of consecutive naturals, for example, 2201 + ... + 2586.

It is an arithmetic number, because the mean of its divisors is an integer number (232218).

2⁹²³⁸⁹¹ is an apocalyptic number.

923891 is a deficient number, since it is larger than the sum of its proper divisors (4981).

923891 is a wasteful number, since it uses less digits than its factorization.

923891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4980.

The product of its digits is 3888, while the sum is 32.

The square root of 923891 is about 961.1924885266. The cubic root of 923891 is about 97.3958036553.

The spelling of 923891 in words is "nine hundred twenty-three thousand, eight hundred ninety-one".