805420 has 48 divisors (see below), whose sum is σ = 2112768. Its totient is φ = 250560.

The previous prime is 805403. The next prime is 805421. The reversal of 805420 is 24508.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (805421) by changing a digit.

805420 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1279 + ... + 1801.

It is an arithmetic number, because the mean of its divisors is an integer number (44016).

2⁸⁰⁵⁴²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 805420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1056384).

805420 is an abundant number, since it is smaller than the sum of its proper divisors (1307348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

805420 is a wasteful number, since it uses less digits than its factorization.

805420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550 (or 548 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 805420 is about 897.4519485744. The cubic root of 805420 is about 93.0409500934.

Adding to 805420 its reverse (24508), we get a palindrome (829928).

It can be divided in two parts, 805 and 420, that added together give a triangular number (1225 = T₄₉).

The spelling of 805420 in words is "eight hundred five thousand, four hundred twenty".