877921 has 4 divisors (see below), whose sum is σ = 957744. Its totient is φ = 798100.

The previous prime is 877909. The next prime is 877937. The reversal of 877921 is 129778.

877921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-877921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (877321) 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, 39895 + ... + 39916.

It is an arithmetic number, because the mean of its divisors is an integer number (239436).

2⁸⁷⁷⁹²¹ is an apocalyptic number.

It is an amenable number.

877921 is a deficient number, since it is larger than the sum of its proper divisors (79823).

877921 is a wasteful number, since it uses less digits than its factorization.

877921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79822.

The product of its digits is 7056, while the sum is 34.

The square root of 877921 is about 936.9743859893. The cubic root of 877921 is about 95.7528727718.

It can be divided in two parts, 87 and 7921, that added together give a palindrome (8008).

The spelling of 877921 in words is "eight hundred seventy-seven thousand, nine hundred twenty-one".