12125405 has 4 divisors (see below), whose sum is σ = 14550492. Its totient is φ = 9700320.

The previous prime is 12125359. The next prime is 12125413. The reversal of 12125405 is 50452121.

12125405 is digitally balanced in base 2 and base 3, because in such bases 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: 50452121 = 181 ⋅278741.

It can be written as a sum of positive squares in 2 ways, for example, as 9156676 + 2968729 = 3026^2 + 1723^2 .

It is not a de Polignac number, because 12125405 - 2⁶ = 12125341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1212536 + ... + 1212545.

It is an arithmetic number, because the mean of its divisors is an integer number (3637623).

Almost surely, 2^12125405 is an apocalyptic number.

It is an amenable number.

12125405 is a deficient number, since it is larger than the sum of its proper divisors (2425087).

12125405 is an equidigital number, since it uses as much as digits as its factorization.

12125405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425086.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 12125405 is about 3482.1552234213. The cubic root of 12125405 is about 229.7376024566.

Adding to 12125405 its reverse (50452121), we get a palindrome (62577526).

The spelling of 12125405 in words is "twelve million, one hundred twenty-five thousand, four hundred five".