12509118 has 12 divisors (see below), whose sum is σ = 27103128. Its totient is φ = 4169700.

The previous prime is 12509117. The next prime is 12509129. The reversal of 12509118 is 81190521.

It is a junction number, because it is equal to n+sod(n) for n = 12509091 and 12509100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12509117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 347458 + ... + 347493.

It is an arithmetic number, because the mean of its divisors is an integer number (2258594).

Almost surely, 2^12509118 is an apocalyptic number.

12509118 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12509118 is an abundant number, since it is smaller than the sum of its proper divisors (14594010).

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

12509118 is a wasteful number, since it uses less digits than its factorization.

12509118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694959 (or 694956 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 12509118 is about 3536.8231507951. The cubic root of 12509118 is about 232.1358573082.

Adding to 12509118 its reverse (81190521), we get a palindrome (93699639).

The spelling of 12509118 in words is "twelve million, five hundred nine thousand, one hundred eighteen".