834821 has 4 divisors (see below), whose sum is σ = 899052. Its totient is φ = 770592.

The previous prime is 834811. The next prime is 834829. The reversal of 834821 is 128438.

834821 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.

It can be written as a sum of positive squares in 2 ways, for example, as 172225 + 662596 = 415^2 + 814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-834821 is a prime.

It is a super-2 number, since 2×834821² = 1393852204082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (834829) 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, 32096 + ... + 32121.

It is an arithmetic number, because the mean of its divisors is an integer number (224763).

2⁸³⁴⁸²¹ is an apocalyptic number.

It is an amenable number.

834821 is a deficient number, since it is larger than the sum of its proper divisors (64231).

834821 is a wasteful number, since it uses less digits than its factorization.

834821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64230.

The product of its digits is 1536, while the sum is 26.

The square root of 834821 is about 913.6853944329. The cubic root of 834821 is about 94.1595675159.

The spelling of 834821 in words is "eight hundred thirty-four thousand, eight hundred twenty-one".