12312403 has 4 divisors (see below), whose sum is σ = 13036680. Its totient is φ = 11588128.

The previous prime is 12312401. The next prime is 12312407. The reversal of 12312403 is 30421321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30421321 = 7 ⋅4345903.

It is a cyclic number.

It is not a de Polignac number, because 12312403 - 2¹ = 12312401 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 362113 + ... + 362146.

It is an arithmetic number, because the mean of its divisors is an integer number (3259170).

Almost surely, 2^12312403 is an apocalyptic number.

12312403 is a deficient number, since it is larger than the sum of its proper divisors (724277).

12312403 is an equidigital number, since it uses as much as digits as its factorization.

12312403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724276.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 12312403 is about 3508.9033899496. The cubic root of 12312403 is about 230.9125872545.

Adding to 12312403 its reverse (30421321), we get a palindrome (42733724).

The spelling of 12312403 in words is "twelve million, three hundred twelve thousand, four hundred three".