12540005 has 4 divisors (see below), whose sum is σ = 15048012. Its totient is φ = 10032000.

The previous prime is 12539993. The next prime is 12540041. The reversal of 12540005 is 50004521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7739524 + 4800481 = 2782^2 + 2191^2 .

It is not a de Polignac number, because 12540005 - 2¹⁸ = 12277861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1253996 + ... + 1254005.

It is an arithmetic number, because the mean of its divisors is an integer number (3762003).

Almost surely, 2^12540005 is an apocalyptic number.

It is an amenable number.

12540005 is a deficient number, since it is larger than the sum of its proper divisors (2508007).

12540005 is an equidigital number, since it uses as much as digits as its factorization.

12540005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2508006.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 12540005 is about 3541.1869479032. The cubic root of 12540005 is about 232.3267603768.

Adding to 12540005 its reverse (50004521), we get a palindrome (62544526).

The spelling of 12540005 in words is "twelve million, five hundred forty thousand, five".