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808421 is a prime number
BaseRepresentation
bin11000101010111100101
31112001221112
43011113211
5201332141
625154405
76604625
oct3052745
91461845
10808421
11502419
1232ba05
13223c73
14170885
1510e7eb
hexc55e5

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".