2640015 has 72 divisors (see below), whose sum is σ = 5747040. Its totient is φ = 1096704.

The previous prime is 2640013. The next prime is 2640017. The reversal of 2640015 is 5100462.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2640013) and next prime (2640017).

It is not a de Polignac number, because 2640015 - 2¹ = 2640013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2640015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640013) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 91021 + ... + 91049.

It is an arithmetic number, because the mean of its divisors is an integer number (79820).

2^2640015 is an apocalyptic number.

2640015 is an abundant number, since it is smaller than the sum of its proper divisors (3107025).

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

2640015 is a wasteful number, since it uses less digits than its factorization.

2640015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81 (or 61 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 2640015 is about 1624.8122968515. The cubic root of 2640015 is about 138.2087263582.

Adding to 2640015 its reverse (5100462), we get a palindrome (7740477).

The spelling of 2640015 in words is "two million, six hundred forty thousand, fifteen".