826421 has 8 divisors (see below), whose sum is σ = 883224. Its totient is φ = 770560.

The previous prime is 826411. The next prime is 826453. The reversal of 826421 is 124628.

826421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 483025 + 343396 = 695^2 + 586^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 826421 - 2¹⁰ = 825397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (826411) 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, 2801 + ... + 3081.

It is an arithmetic number, because the mean of its divisors is an integer number (110403).

2⁸²⁶⁴²¹ is an apocalyptic number.

It is an amenable number.

826421 is a deficient number, since it is larger than the sum of its proper divisors (56803).

826421 is a wasteful number, since it uses less digits than its factorization.

826421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471.

The product of its digits is 768, while the sum is 23.

The square root of 826421 is about 909.0770044391. The cubic root of 826421 is about 93.8426899575.

The spelling of 826421 in words is "eight hundred twenty-six thousand, four hundred twenty-one".