12017145 has 32 divisors (see below), whose sum is σ = 22125312. Its totient is φ = 5455872.

The previous prime is 12017143. The next prime is 12017149. The reversal of 12017145 is 54171021.

It is a happy number.

It is not a de Polignac number, because 12017145 - 2¹ = 12017143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (12017143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19969 + ... + 20561.

It is an arithmetic number, because the mean of its divisors is an integer number (691416).

Almost surely, 2^12017145 is an apocalyptic number.

12017145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12017145 is a deficient number, since it is larger than the sum of its proper divisors (10108167).

12017145 is a wasteful number, since it uses less digits than its factorization.

12017145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801.

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 12017145 is about 3466.5753994396. The cubic root of 12017145 is about 229.0518306560.

Adding to 12017145 its reverse (54171021), we get a palindrome (66188166).

The spelling of 12017145 in words is "twelve million, seventeen thousand, one hundred forty-five".