8138940 has 24 divisors (see below), whose sum is σ = 22789200. Its totient is φ = 2170368.

The previous prime is 8138909. The next prime is 8138947. The reversal of 8138940 is 498318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8138947) 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, 67765 + ... + 67884.

It is an arithmetic number, because the mean of its divisors is an integer number (949550).

Almost surely, 2^8138940 is an apocalyptic number.

It is an amenable number.

8138940 is an abundant number, since it is smaller than the sum of its proper divisors (14650260).

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

8138940 is a wasteful number, since it uses less digits than its factorization.

8138940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135661 (or 135659 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 8138940 is about 2852.8827525855. The cubic root of 8138940 is about 201.1511943774.

The spelling of 8138940 in words is "eight million, one hundred thirty-eight thousand, nine hundred forty".