6540138 has 96 divisors (see below), whose sum is σ = 17184960. Its totient is φ = 1774080.

The previous prime is 6540133. The next prime is 6540139. The reversal of 6540138 is 8310456.

6540138 is a `hidden beast` number, since 654 + 0 + 1 + 3 + 8 = 666.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (6540133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 97581 + ... + 97647.

It is an arithmetic number, because the mean of its divisors is an integer number (179010).

Almost surely, 2^6540138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6540138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8592480).

6540138 is an abundant number, since it is smaller than the sum of its proper divisors (10644822).

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

6540138 is a wasteful number, since it uses less digits than its factorization.

6540138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 6540138 is about 2557.3693515017. The cubic root of 6540138 is about 187.0089122312.

The spelling of 6540138 in words is "six million, five hundred forty thousand, one hundred thirty-eight".