8109140 has 24 divisors (see below), whose sum is σ = 18339720. Its totient is φ = 2994048.

The previous prime is 8109139. The next prime is 8109149. The reversal of 8109140 is 419018.

It can be written as a sum of positive squares in 4 ways, for example, as 111556 + 7997584 = 334^2 + 2828^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8109149) 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, 15335 + ... + 15854.

It is an arithmetic number, because the mean of its divisors is an integer number (764155).

Almost surely, 2^8109140 is an apocalyptic number.

It is an amenable number.

8109140 is an abundant number, since it is smaller than the sum of its proper divisors (10230580).

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

8109140 is a wasteful number, since it uses less digits than its factorization.

8109140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31211 (or 31209 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 8109140 is about 2847.6551757543. The cubic root of 8109140 is about 200.9053951135.

The spelling of 8109140 in words is "eight million, one hundred nine thousand, one hundred forty".