836921 has 2 divisors, whose sum is σ = 836922. Its totient is φ = 836920.

The previous prime is 836917. The next prime is 836939. The reversal of 836921 is 129638.

836921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 490000 + 346921 = 700^2 + 589^2 .

It is a cyclic number.

It is not a de Polignac number, because 836921 - 2² = 836917 is a prime.

It is a Chen prime.

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

It is equal to p₆₆₆₇₄ and since 836921 and 66674 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 836921.

It is not a weakly prime, because it can be changed into another prime (836951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 418460 + 418461.

It is an arithmetic number, because the mean of its divisors is an integer number (418461).

2⁸³⁶⁹²¹ is an apocalyptic number.

It is an amenable number.

836921 is a deficient number, since it is larger than the sum of its proper divisors (1).

836921 is an equidigital number, since it uses as much as digits as its factorization.

836921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The square root of 836921 is about 914.8338646989. The cubic root of 836921 is about 94.2384544955.

The spelling of 836921 in words is "eight hundred thirty-six thousand, nine hundred twenty-one".