12013945 has 4 divisors (see below), whose sum is σ = 14416740. Its totient is φ = 9611152.

The previous prime is 12013931. The next prime is 12013949. The reversal of 12013945 is 54931021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54931021 = 41 ⋅1339781.

It can be written as a sum of positive squares in 2 ways, for example, as 9504889 + 2509056 = 3083^2 + 1584^2 .

It is a cyclic number.

It is not a de Polignac number, because 12013945 - 2⁹ = 12013433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12013949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1201390 + ... + 1201399.

It is an arithmetic number, because the mean of its divisors is an integer number (3604185).

Almost surely, 2^12013945 is an apocalyptic number.

It is an amenable number.

12013945 is a deficient number, since it is larger than the sum of its proper divisors (2402795).

12013945 is an equidigital number, since it uses as much as digits as its factorization.

12013945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2402794.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 12013945 is about 3466.1138180966. The cubic root of 12013945 is about 229.0314977364.

Adding to 12013945 its reverse (54931021), we get a palindrome (66944966).

The spelling of 12013945 in words is "twelve million, thirteen thousand, nine hundred forty-five".