12015945 has 20 divisors (see below), whose sum is σ = 21540420. Its totient is φ = 6408288.

The previous prime is 12015943. The next prime is 12015953. The reversal of 12015945 is 54951021.

It can be written as a sum of positive squares in 2 ways, for example, as 1750329 + 10265616 = 1323^2 + 3204^2 .

It is not a de Polignac number, because 12015945 - 2¹ = 12015943 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (12015943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14430 + ... + 15239.

It is an arithmetic number, because the mean of its divisors is an integer number (1077021).

Almost surely, 2^12015945 is an apocalyptic number.

12015945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12015945 is a deficient number, since it is larger than the sum of its proper divisors (9524475).

12015945 is an equidigital number, since it uses as much as digits as its factorization.

12015945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29686 (or 29677 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 12015945 is about 3466.4023136387. The cubic root of 12015945 is about 229.0442062342.

Adding to 12015945 its reverse (54951021), we get a palindrome (66966966).

The spelling of 12015945 in words is "twelve million, fifteen thousand, nine hundred forty-five".