12311405 has 4 divisors (see below), whose sum is σ = 14773692. Its totient is φ = 9849120.

The previous prime is 12311401. The next prime is 12311419. The reversal of 12311405 is 50411321.

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 6901129 + 5410276 = 2627^2 + 2326^2 .

It is not a de Polignac number, because 12311405 - 2² = 12311401 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 (12311401) 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 3 ways as a sum of consecutive naturals, for example, 1231136 + ... + 1231145.

It is an arithmetic number, because the mean of its divisors is an integer number (3693423).

Almost surely, 2^12311405 is an apocalyptic number.

It is an amenable number.

12311405 is a deficient number, since it is larger than the sum of its proper divisors (2462287).

12311405 is an equidigital number, since it uses as much as digits as its factorization.

12311405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2462286.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 12311405 is about 3508.7611773958. The cubic root of 12311405 is about 230.9063480991.

Adding to 12311405 its reverse (50411321), we get a palindrome (62722726).

The spelling of 12311405 in words is "twelve million, three hundred eleven thousand, four hundred five".