12128615 has 4 divisors (see below), whose sum is σ = 14554344. Its totient is φ = 9702888.

The previous prime is 12128609. The next prime is 12128617. The reversal of 12128615 is 51682121.

12128615 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12128615 - 2¹⁴ = 12112231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12128617) 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, 1212857 + ... + 1212866.

It is an arithmetic number, because the mean of its divisors is an integer number (3638586).

Almost surely, 2^12128615 is an apocalyptic number.

12128615 is a deficient number, since it is larger than the sum of its proper divisors (2425729).

12128615 is an equidigital number, since it uses as much as digits as its factorization.

12128615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425728.

The product of its digits is 960, while the sum is 26.

The square root of 12128615 is about 3482.6161143600. The cubic root of 12128615 is about 229.7578737420.

The spelling of 12128615 in words is "twelve million, one hundred twenty-eight thousand, six hundred fifteen".