12540218 has 8 divisors (see below), whose sum is σ = 18930612. Its totient is φ = 6230016.

The previous prime is 12540217. The next prime is 12540259. The reversal of 12540218 is 81204521.

It can be written as a sum of positive squares in 2 ways, for example, as 12439729 + 100489 = 3527^2 + 317^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 12540193 and 12540202.

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 3 ways as a sum of consecutive naturals, for example, 19655 + ... + 20282.

Almost surely, 2^12540218 is an apocalyptic number.

12540218 is a deficient number, since it is larger than the sum of its proper divisors (6390394).

12540218 is a wasteful number, since it uses less digits than its factorization.

12540218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40096.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 12540218 is about 3541.2170224373. The cubic root of 12540218 is about 232.3280757755.

Adding to 12540218 its reverse (81204521), we get a palindrome (93744739).

The spelling of 12540218 in words is "twelve million, five hundred forty thousand, two hundred eighteen".