823881 has 4 divisors (see below), whose sum is σ = 1098512. Its totient is φ = 549252.

The previous prime is 823877. The next prime is 823903. The reversal of 823881 is 188328.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 823881 - 2² = 823877 is a prime.

It is a super-2 number, since 2×823881² = 1357559804322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 823881.

It is not an unprimeable number, because it can be changed into a prime (823831) 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, 137311 + ... + 137316.

It is an arithmetic number, because the mean of its divisors is an integer number (274628).

2⁸²³⁸⁸¹ is an apocalyptic number.

It is an amenable number.

823881 is a deficient number, since it is larger than the sum of its proper divisors (274631).

823881 is a wasteful number, since it uses less digits than its factorization.

823881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274630.

The product of its digits is 3072, while the sum is 30.

The square root of 823881 is about 907.6789079845. The cubic root of 823881 is about 93.7464496433.

The spelling of 823881 in words is "eight hundred twenty-three thousand, eight hundred eighty-one".