887981 has 4 divisors (see below), whose sum is σ = 891132. Its totient is φ = 884832.

The previous prime is 887947. The next prime is 887987. The reversal of 887981 is 189788.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15625 + 872356 = 125^2 + 934^2 .

It is a cyclic number.

It is not a de Polignac number, because 887981 - 2¹⁴ = 871597 is a prime.

It is a super-2 number, since 2×887981² = 1577020512722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (887987) 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, 1106 + ... + 1731.

It is an arithmetic number, because the mean of its divisors is an integer number (222783).

2⁸⁸⁷⁹⁸¹ is an apocalyptic number.

It is an amenable number.

887981 is a deficient number, since it is larger than the sum of its proper divisors (3151).

887981 is a wasteful number, since it uses less digits than its factorization.

887981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3150.

The product of its digits is 32256, while the sum is 41.

The square root of 887981 is about 942.3274377837. The cubic root of 887981 is about 96.1172251436.

The spelling of 887981 in words is "eight hundred eighty-seven thousand, nine hundred eighty-one".