12312405 has 80 divisors (see below), whose sum is σ = 26066304. Its totient is φ = 5443200.

The previous prime is 12312401. The next prime is 12312407. The reversal of 12312405 is 50421321.

It is not a de Polignac number, because 12312405 - 2² = 12312401 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12312401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 121855 + ... + 121955.

Almost surely, 2^12312405 is an apocalyptic number.

12312405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12312405 is an abundant number, since it is smaller than the sum of its proper divisors (13753899).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12312405 is a wasteful number, since it uses less digits than its factorization.

12312405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168 (or 159 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 12312405 is about 3508.9036749389. The cubic root of 12312405 is about 230.9125997575.

Adding to 12312405 its reverse (50421321), we get a palindrome (62733726).

The spelling of 12312405 in words is "twelve million, three hundred twelve thousand, four hundred five".