887821 has 8 divisors (see below), whose sum is σ = 991584. Its totient is φ = 787920.

The previous prime is 887819. The next prime is 887827. The reversal of 887821 is 128788.

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

It is a cyclic number.

It is not a de Polignac number, because 887821 - 2¹ = 887819 is a prime.

It is a super-2 number, since 2×887821² = 1576452256082, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (887827) 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, 466 + ... + 1411.

It is an arithmetic number, because the mean of its divisors is an integer number (123948).

2⁸⁸⁷⁸²¹ is an apocalyptic number.

It is an amenable number.

887821 is a deficient number, since it is larger than the sum of its proper divisors (103763).

887821 is a wasteful number, since it uses less digits than its factorization.

887821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1931.

The product of its digits is 7168, while the sum is 34.

The square root of 887821 is about 942.2425377789. The cubic root of 887821 is about 96.1114518670. Note that the first 3 decimals are identical.

The spelling of 887821 in words is "eight hundred eighty-seven thousand, eight hundred twenty-one".