858921 has 12 divisors (see below), whose sum is σ = 1332432. Its totient is φ = 490728.

The previous prime is 858919. The next prime is 858931. The reversal of 858921 is 129858.

It is a happy number.

858921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 858921 - 2¹ = 858919 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 858921.

It is not an unprimeable number, because it can be changed into a prime (858911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2775 + ... + 3068.

It is an arithmetic number, because the mean of its divisors is an integer number (111036).

2⁸⁵⁸⁹²¹ is an apocalyptic number.

It is an amenable number.

858921 is a deficient number, since it is larger than the sum of its proper divisors (473511).

858921 is a wasteful number, since it uses less digits than its factorization.

858921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5860 (or 5853 counting only the distinct ones).

The product of its digits is 5760, while the sum is 33.

The square root of 858921 is about 926.7799091478. The cubic root of 858921 is about 95.0570663598.

The spelling of 858921 in words is "eight hundred fifty-eight thousand, nine hundred twenty-one".