846921 has 4 divisors (see below), whose sum is σ = 1129232. Its totient is φ = 564612.

The previous prime is 846919. The next prime is 846931. The reversal of 846921 is 129648.

846921 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 not a de Polignac number, because 846921 - 2¹ = 846919 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (846931) 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, 141151 + ... + 141156.

It is an arithmetic number, because the mean of its divisors is an integer number (282308).

2⁸⁴⁶⁹²¹ is an apocalyptic number.

It is an amenable number.

846921 is a deficient number, since it is larger than the sum of its proper divisors (282311).

846921 is a wasteful number, since it uses less digits than its factorization.

846921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282310.

The product of its digits is 3456, while the sum is 30.

The square root of 846921 is about 920.2831086139. The cubic root of 846921 is about 94.6123073380.

Adding to 846921 its sum of digits (30), we get a triangular number (846951 = T₁₃₀₁).

The spelling of 846921 in words is "eight hundred forty-six thousand, nine hundred twenty-one".