806021 has 6 divisors (see below), whose sum is σ = 856530. Its totient is φ = 758336.

The previous prime is 806017. The next prime is 806023. The reversal of 806021 is 120608.

It can be written as a sum of positive squares in 3 ways, for example, as 376996 + 429025 = 614^2 + 655^2 .

It is not a de Polignac number, because 806021 - 2² = 806017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a magnanimous number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (806023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1106 + ... + 1683.

It is an arithmetic number, because the mean of its divisors is an integer number (142755).

2⁸⁰⁶⁰²¹ is an apocalyptic number.

It is an amenable number.

806021 is a deficient number, since it is larger than the sum of its proper divisors (50509).

806021 is a wasteful number, since it uses less digits than its factorization.

806021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2823 (or 2806 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 806021 is about 897.7867230027. The cubic root of 806021 is about 93.0640865557.

Adding to 806021 its reverse (120608), we get a palindrome (926629).

The spelling of 806021 in words is "eight hundred six thousand, twenty-one".