891993 has 8 divisors (see below), whose sum is σ = 1252000. Its totient is φ = 563328.

The previous prime is 891991. The next prime is 891997. The reversal of 891993 is 399198.

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

It is not a de Polignac number, because 891993 - 2¹ = 891991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (891991) 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 7 ways as a sum of consecutive naturals, for example, 7768 + ... + 7881.

It is an arithmetic number, because the mean of its divisors is an integer number (156500).

2⁸⁹¹⁹⁹³ is an apocalyptic number.

It is an amenable number.

891993 is a deficient number, since it is larger than the sum of its proper divisors (360007).

891993 is a wasteful number, since it uses less digits than its factorization.

891993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15671.

The product of its digits is 17496, while the sum is 39.

The square root of 891993 is about 944.4538104111. The cubic root of 891993 is about 96.2617638964.

The spelling of 891993 in words is "eight hundred ninety-one thousand, nine hundred ninety-three".