987823 has 4 divisors (see below), whose sum is σ = 1001808. Its totient is φ = 973840.

The previous prime is 987821. The next prime is 987851. The reversal of 987823 is 328789.

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

It is a cyclic number.

It is not a de Polignac number, because 987823 - 2¹ = 987821 is a prime.

It is a Duffinian number.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 6886 + ... + 7027.

It is an arithmetic number, because the mean of its divisors is an integer number (250452).

2⁹⁸⁷⁸²³ is an apocalyptic number.

987823 is a deficient number, since it is larger than the sum of its proper divisors (13985).

987823 is a wasteful number, since it uses less digits than its factorization.

987823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13984.

The product of its digits is 24192, while the sum is 37.

The square root of 987823 is about 993.8928513678. The cubic root of 987823 is about 99.5924412149.

It can be divided in two parts, 98 and 7823, that added together give a square (7921 = 89²).

The spelling of 987823 in words is "nine hundred eighty-seven thousand, eight hundred twenty-three".