887991 has 8 divisors (see below), whose sum is σ = 1275120. Its totient is φ = 546432.

The previous prime is 887989. The next prime is 888001. The reversal of 887991 is 199788.

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

It is not a de Polignac number, because 887991 - 2¹ = 887989 is a prime.

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 887991.

It is not an unprimeable number, because it can be changed into a prime (887911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11346 + ... + 11423.

It is an arithmetic number, because the mean of its divisors is an integer number (159390).

2⁸⁸⁷⁹⁹¹ is an apocalyptic number.

887991 is a deficient number, since it is larger than the sum of its proper divisors (387129).

887991 is a wasteful number, since it uses less digits than its factorization.

887991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22785.

The product of its digits is 36288, while the sum is 42.

The square root of 887991 is about 942.3327437800. The cubic root of 887991 is about 96.1175859503.

The spelling of 887991 in words is "eight hundred eighty-seven thousand, nine hundred ninety-one".