12418578 has 12 divisors (see below), whose sum is σ = 26906958. Its totient is φ = 4139520.

The previous prime is 12418561. The next prime is 12418579. The reversal of 12418578 is 87581421.

It can be written as a sum of positive squares in only one way, i.e., 11309769 + 1108809 = 3363^2 + 1053^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12418579) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 344943 + ... + 344978.

Almost surely, 2^12418578 is an apocalyptic number.

12418578 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12418578 is an abundant number, since it is smaller than the sum of its proper divisors (14488380).

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

12418578 is a wasteful number, since it uses less digits than its factorization.

12418578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689929 (or 689926 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 12418578 is about 3524.0002837684. Note that the first 3 decimals coincide. The cubic root of 12418578 is about 231.5744403411.

Adding to 12418578 its reverse (87581421), we get a palindrome (99999999).

It can be divided in two parts, 12418 and 578, that added together give a square (12996 = 114²).

The spelling of 12418578 in words is "twelve million, four hundred eighteen thousand, five hundred seventy-eight".