987811 has 8 divisors (see below), whose sum is σ = 1090800. Its totient is φ = 887040.

The previous prime is 987809. The next prime is 987821. The reversal of 987811 is 118789.

987811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 987811 - 2¹ = 987809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (987821) 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, 475 + ... + 1483.

It is an arithmetic number, because the mean of its divisors is an integer number (136350).

2⁹⁸⁷⁸¹¹ is an apocalyptic number.

987811 is a deficient number, since it is larger than the sum of its proper divisors (102989).

987811 is a wasteful number, since it uses less digits than its factorization.

987811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109.

The product of its digits is 4032, while the sum is 34.

The square root of 987811 is about 993.8868144814. The cubic root of 987811 is about 99.5920379328.

It can be divided in two parts, 9878 and 11, that added together give a palindrome (9889).

The spelling of 987811 in words is "nine hundred eighty-seven thousand, eight hundred eleven".