12540213 has 24 divisors (see below), whose sum is σ = 21372416. Its totient is φ = 6933600.

The previous prime is 12540181. The next prime is 12540217. The reversal of 12540213 is 31204521.

It is not a de Polignac number, because 12540213 - 2⁵ = 12540181 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12540217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1258 + ... + 5163.

Almost surely, 2^12540213 is an apocalyptic number.

It is an amenable number.

12540213 is a deficient number, since it is larger than the sum of its proper divisors (8832203).

12540213 is a wasteful number, since it uses less digits than its factorization.

12540213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6465 (or 6462 counting only the distinct ones).

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

The square root of 12540213 is about 3541.2163164653. The cubic root of 12540213 is about 232.3280448978.

Adding to 12540213 its reverse (31204521), we get a palindrome (43744734).

It can be divided in two parts, 12 and 540213, that added together give a square (540225 = 735²).

The spelling of 12540213 in words is "twelve million, five hundred forty thousand, two hundred thirteen".