8220340 has 24 divisors (see below), whose sum is σ = 17859240. Its totient is φ = 3174528.

The previous prime is 8220337. The next prime is 8220341. The reversal of 8220340 is 430228.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2178576 + 6041764 = 1476^2 + 2458^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8220341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6507 + ... + 7666.

It is an arithmetic number, because the mean of its divisors is an integer number (744135).

Almost surely, 2^8220340 is an apocalyptic number.

It is an amenable number.

8220340 is an abundant number, since it is smaller than the sum of its proper divisors (9638900).

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

8220340 is a wasteful number, since it uses less digits than its factorization.

8220340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14211 (or 14209 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 8220340 is about 2867.1135310622. The cubic root of 8220340 is about 201.8195624277.

Adding to 8220340 its reverse (430228), we get a palindrome (8650568).

The spelling of 8220340 in words is "eight million, two hundred twenty thousand, three hundred forty".