12403331 has 4 divisors (see below), whose sum is σ = 12434664. Its totient is φ = 12372000.

The previous prime is 12403309. The next prime is 12403351. The reversal of 12403331 is 13330421.

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: 13330421 = 13 ⋅1025417.

It is a cyclic number.

It is not a de Polignac number, because 12403331 - 2⁶ = 12403267 is a prime.

It is a super-2 number, since 2×12403331² = 307685239791122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12403301) 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 3 ways as a sum of consecutive naturals, for example, 15065 + ... + 15866.

It is an arithmetic number, because the mean of its divisors is an integer number (3108666).

Almost surely, 2^12403331 is an apocalyptic number.

12403331 is a deficient number, since it is larger than the sum of its proper divisors (31333).

12403331 is an equidigital number, since it uses as much as digits as its factorization.

12403331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31332.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 12403331 is about 3521.8363107902. The cubic root of 12403331 is about 231.4796291243.

Adding to 12403331 its reverse (13330421), we get a palindrome (25733752).

The spelling of 12403331 in words is "twelve million, four hundred three thousand, three hundred thirty-one".