12512405 has 4 divisors (see below), whose sum is σ = 15014892. Its totient is φ = 10009920.

The previous prime is 12512389. The next prime is 12512407. The reversal of 12512405 is 50421521.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5340721 + 7171684 = 2311^2 + 2678^2 .

It is not a de Polignac number, because 12512405 - 2⁴ = 12512389 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 (12512407) 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, 1251236 + ... + 1251245.

It is an arithmetic number, because the mean of its divisors is an integer number (3753723).

Almost surely, 2^12512405 is an apocalyptic number.

It is an amenable number.

12512405 is a deficient number, since it is larger than the sum of its proper divisors (2502487).

12512405 is an equidigital number, since it uses as much as digits as its factorization.

12512405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2502486.

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

The square root of 12512405 is about 3537.2878028229. The cubic root of 12512405 is about 232.1561881778.

Adding to 12512405 its reverse (50421521), we get a palindrome (62933926).

The spelling of 12512405 in words is "twelve million, five hundred twelve thousand, four hundred five".