2640138 has 8 divisors (see below), whose sum is σ = 5280288. Its totient is φ = 880044.

The previous prime is 2640137. The next prime is 2640139. The reversal of 2640138 is 8310462.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2640137) and next prime (2640139).

It is a sphenic number, since it is the product of 3 distinct primes.

2640138 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2640137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220006 + ... + 220017.

It is an arithmetic number, because the mean of its divisors is an integer number (660036).

2^2640138 is an apocalyptic number.

2640138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2640138 is a wasteful number, since it uses less digits than its factorization.

2640138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440028.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 2640138 is about 1624.8501469366. The cubic root of 2640138 is about 138.2108727361.

The spelling of 2640138 in words is "two million, six hundred forty thousand, one hundred thirty-eight".