808421 has 2 divisors, whose sum is σ = 808422. Its totient is φ = 808420.

The previous prime is 808417. The next prime is 808439. The reversal of 808421 is 124808.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 801025 + 7396 = 895^2 + 86^2 .

It is a cyclic number.

It is not a de Polignac number, because 808421 - 2² = 808417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (808441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404210 + 404211.

It is an arithmetic number, because the mean of its divisors is an integer number (404211).

2⁸⁰⁸⁴²¹ is an apocalyptic number.

It is an amenable number.

808421 is a deficient number, since it is larger than the sum of its proper divisors (1).

808421 is an equidigital number, since it uses as much as digits as its factorization.

808421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 808421 is about 899.1223498501. The cubic root of 808421 is about 93.1563639233.

The spelling of 808421 in words is "eight hundred eight thousand, four hundred twenty-one".