8199440 has 40 divisors (see below), whose sum is σ = 20188440. Its totient is φ = 3086336.

The previous prime is 8199427. The next prime is 8199449. The reversal of 8199440 is 449918.

It can be written as a sum of positive squares in 4 ways, for example, as 3671056 + 4528384 = 1916^2 + 2128^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 8199440.

It is not an unprimeable number, because it can be changed into a prime (8199449) 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 7 ways as a sum of consecutive naturals, for example, 1655 + ... + 4374.

It is an arithmetic number, because the mean of its divisors is an integer number (504711).

Almost surely, 2^8199440 is an apocalyptic number.

8199440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8199440 is an abundant number, since it is smaller than the sum of its proper divisors (11989000).

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

8199440 is a wasteful number, since it uses less digits than its factorization.

8199440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6059 (or 6053 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 8199440 is about 2863.4664307444. The cubic root of 8199440 is about 201.6483769433.

The spelling of 8199440 in words is "eight million, one hundred ninety-nine thousand, four hundred forty".