8021380 has 12 divisors (see below), whose sum is σ = 16844940. Its totient is φ = 3208544.

The previous prime is 8021359. The next prime is 8021381. The reversal of 8021380 is 831208.

It can be written as a sum of positive squares in 2 ways, for example, as 2795584 + 5225796 = 1672^2 + 2286^2 .

It is not an unprimeable number, because it can be changed into a prime (8021381) 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 in 3 ways as a sum of consecutive naturals, for example, 200515 + ... + 200554.

It is an arithmetic number, because the mean of its divisors is an integer number (1403745).

Almost surely, 2^8021380 is an apocalyptic number.

It is an amenable number.

8021380 is an abundant number, since it is smaller than the sum of its proper divisors (8823560).

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

8021380 is a wasteful number, since it uses less digits than its factorization.

8021380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401078 (or 401076 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 8021380 is about 2832.2040886913. The cubic root of 8021380 is about 200.1780081851.

Adding to 8021380 its reverse (831208), we get a palindrome (8852588).

The spelling of 8021380 in words is "eight million, twenty-one thousand, three hundred eighty".