12145518 has 128 divisors (see below), whose sum is σ = 35389440. Its totient is φ = 2993760.

The previous prime is 12145513. The next prime is 12145537. The reversal of 12145518 is 81554121.

12145518 is a `hidden beast` number, since 1 + 2 + 145 + 518 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 12145491 and 12145500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12145513) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 95571 + ... + 95697.

It is an arithmetic number, because the mean of its divisors is an integer number (276480).

Almost surely, 2^12145518 is an apocalyptic number.

12145518 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12145518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17694720).

12145518 is an abundant number, since it is smaller than the sum of its proper divisors (23243922).

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

12145518 is a wasteful number, since it uses less digits than its factorization.

12145518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 173 counting only the distinct ones).

The product of its digits is 1600, while the sum is 27.

The square root of 12145518 is about 3485.0420370492. The cubic root of 12145518 is about 229.8645579379.

Adding to 12145518 its reverse (81554121), we get a palindrome (93699639).

It can be divided in two parts, 12 and 145518, that added together give a triangular number (145530 = T₅₃₉).

The spelling of 12145518 in words is "twelve million, one hundred forty-five thousand, five hundred eighteen".