806421 has 16 divisors (see below), whose sum is σ = 1340928. Its totient is φ = 418800.

The previous prime is 806389. The next prime is 806447. The reversal of 806421 is 124608.

It is not a de Polignac number, because 806421 - 2⁵ = 806389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (806521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1515 + ... + 1976.

It is an arithmetic number, because the mean of its divisors is an integer number (83808).

2⁸⁰⁶⁴²¹ is an apocalyptic number.

It is an amenable number.

806421 is a deficient number, since it is larger than the sum of its proper divisors (534507).

806421 is a wasteful number, since it uses less digits than its factorization.

806421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3512.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 806421 is about 898.0094654290. The cubic root of 806421 is about 93.0794788256.

The spelling of 806421 in words is "eight hundred six thousand, four hundred twenty-one".