8021340 has 36 divisors (see below), whose sum is σ = 24331944. Its totient is φ = 2138976.

The previous prime is 8021339. The next prime is 8021347. The reversal of 8021340 is 431208.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8021347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22102 + ... + 22461.

Almost surely, 2^8021340 is an apocalyptic number.

It is an amenable number.

8021340 is an abundant number, since it is smaller than the sum of its proper divisors (16310604).

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

8021340 is a wasteful number, since it uses less digits than its factorization.

8021340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44578 (or 44573 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 8021340 is about 2832.1970270446. The cubic root of 8021340 is about 200.1776754438.

Adding to 8021340 its reverse (431208), we get a palindrome (8452548).

The spelling of 8021340 in words is "eight million, twenty-one thousand, three hundred forty".