8199940 has 48 divisors (see below), whose sum is σ = 20224512. Its totient is φ = 2733696.

The previous prime is 8199931. The next prime is 8199941. The reversal of 8199940 is 499918.

It is a junction number, because it is equal to n+sod(n) for n = 8199893 and 8199902.

It is not an unprimeable number, because it can be changed into a prime (8199941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4389 + ... + 5971.

It is an arithmetic number, because the mean of its divisors is an integer number (421344).

Almost surely, 2^8199940 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 8199940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10112256).

8199940 is an abundant number, since it is smaller than the sum of its proper divisors (12024572).

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

8199940 is a wasteful number, since it uses less digits than its factorization.

8199940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636 (or 1634 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 8199940 is about 2863.5537361817. The cubic root of 8199940 is about 201.6524756841.

The spelling of 8199940 in words is "eight million, one hundred ninety-nine thousand, nine hundred forty".