993891 has 8 divisors (see below), whose sum is σ = 1368064. Its totient is φ = 641160.

The previous prime is 993887. The next prime is 993893. The reversal of 993891 is 198399.

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

It is not a de Polignac number, because 993891 - 2² = 993887 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (993893) 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, 5251 + ... + 5436.

It is an arithmetic number, because the mean of its divisors is an integer number (171008).

2⁹⁹³⁸⁹¹ is an apocalyptic number.

993891 is a deficient number, since it is larger than the sum of its proper divisors (374173).

993891 is a wasteful number, since it uses less digits than its factorization.

993891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10721.

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

The square root of 993891 is about 996.9408207110. The cubic root of 993891 is about 99.7959505882.

The spelling of 993891 in words is "nine hundred ninety-three thousand, eight hundred ninety-one".