12312578 has 4 divisors (see below), whose sum is σ = 18468870. Its totient is φ = 6156288.

The previous prime is 12312571. The next prime is 12312581. The reversal of 12312578 is 87521321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87521321 = 17 ⋅5148313.

It can be written as a sum of positive squares in only one way, i.e., 11854249 + 458329 = 3443^2 + 677^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12312578.

It is not an unprimeable number, because it can be changed into a prime (12312571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3078143 + ... + 3078146.

Almost surely, 2^12312578 is an apocalyptic number.

12312578 is a deficient number, since it is larger than the sum of its proper divisors (6156292).

12312578 is an equidigital number, since it uses as much as digits as its factorization.

12312578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6156291.

The product of its digits is 3360, while the sum is 29.

The square root of 12312578 is about 3508.9283264267. The cubic root of 12312578 is about 230.9136812600.

Adding to 12312578 its reverse (87521321), we get a palindrome (99833899).

The spelling of 12312578 in words is "twelve million, three hundred twelve thousand, five hundred seventy-eight".