826921 has 2 divisors, whose sum is σ = 826922. Its totient is φ = 826920.

The previous prime is 826907. The next prime is 826927. The reversal of 826921 is 129628.

It is a happy number.

826921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 714025 + 112896 = 845^2 + 336^2 .

It is a cyclic number.

It is not a de Polignac number, because 826921 - 2¹⁵ = 794153 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 826921.

It is not a weakly prime, because it can be changed into another prime (826927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 413460 + 413461.

It is an arithmetic number, because the mean of its divisors is an integer number (413461).

2⁸²⁶⁹²¹ is an apocalyptic number.

It is an amenable number.

826921 is a deficient number, since it is larger than the sum of its proper divisors (1).

826921 is an equidigital number, since it uses as much as digits as its factorization.

826921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 28.

The square root of 826921 is about 909.3519670623. The cubic root of 826921 is about 93.8616116635.

The spelling of 826921 in words is "eight hundred twenty-six thousand, nine hundred twenty-one".