12915405 has 24 divisors (see below), whose sum is σ = 22994712. Its totient is φ = 6701184.

The previous prime is 12915403. The next prime is 12915433. The reversal of 12915405 is 50451921.

12915405 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 5673924 + 7241481 = 2382^2 + 2691^2 .

It is not a de Polignac number, because 12915405 - 2¹ = 12915403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12915403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2214 + ... + 5543.

It is an arithmetic number, because the mean of its divisors is an integer number (958113).

Almost surely, 2^12915405 is an apocalyptic number.

12915405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12915405 is a deficient number, since it is larger than the sum of its proper divisors (10079307).

12915405 is a wasteful number, since it uses less digits than its factorization.

12915405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7805 (or 7802 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 12915405 is about 3593.8009126828. The cubic root of 12915405 is about 234.6223298408.

The spelling of 12915405 in words is "twelve million, nine hundred fifteen thousand, four hundred five".