868921 has 8 divisors (see below), whose sum is σ = 933120. Its totient is φ = 806208.

The previous prime is 868909. The next prime is 868937. The reversal of 868921 is 129868.

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

It is not a de Polignac number, because 868921 - 2⁷ = 868793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (868951) 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, 1020 + ... + 1666.

It is an arithmetic number, because the mean of its divisors is an integer number (116640).

2⁸⁶⁸⁹²¹ is an apocalyptic number.

It is an amenable number.

868921 is a deficient number, since it is larger than the sum of its proper divisors (64199).

868921 is a wasteful number, since it uses less digits than its factorization.

868921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743.

The product of its digits is 6912, while the sum is 34.

The square root of 868921 is about 932.1593211463. The cubic root of 868921 is about 95.4245449870.

It can be divided in two parts, 8 and 68921, that multiplied together give a cube (551368 = 82³).

The spelling of 868921 in words is "eight hundred sixty-eight thousand, nine hundred twenty-one".