12078505 has 4 divisors (see below), whose sum is σ = 14494212. Its totient is φ = 9662800.

The previous prime is 12078503. The next prime is 12078511. The reversal of 12078505 is 50587021.

12078505 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, and also an emirpimes, since its reverse is a distinct semiprime: 50587021 = 127 ⋅398323.

It can be written as a sum of positive squares in 2 ways, for example, as 7601049 + 4477456 = 2757^2 + 2116^2 .

It is not a de Polignac number, because 12078505 - 2¹ = 12078503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12078503) 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, 1207846 + ... + 1207855.

It is an arithmetic number, because the mean of its divisors is an integer number (3623553).

Almost surely, 2^12078505 is an apocalyptic number.

It is an amenable number.

12078505 is a deficient number, since it is larger than the sum of its proper divisors (2415707).

12078505 is an equidigital number, since it uses as much as digits as its factorization.

12078505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2415706.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 12078505 is about 3475.4143637846. The cubic root of 12078505 is about 229.4410181270.

The spelling of 12078505 in words is "twelve million, seventy-eight thousand, five hundred five".