12403431 has 12 divisors (see below), whose sum is σ = 18254808. Its totient is φ = 8112624.

The previous prime is 12403423. The next prime is 12403439. The reversal of 12403431 is 13430421.

It is an interprime number because it is at equal distance from previous prime (12403423) and next prime (12403439).

It is not a de Polignac number, because 12403431 - 2³ = 12403423 is a prime.

It is a super-2 number, since 2×12403431² = 307690201143522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12403439) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12525 + ... + 13478.

It is an arithmetic number, because the mean of its divisors is an integer number (1521234).

Almost surely, 2^12403431 is an apocalyptic number.

12403431 is a deficient number, since it is larger than the sum of its proper divisors (5851377).

12403431 is a wasteful number, since it uses less digits than its factorization.

12403431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26062 (or 26059 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 12403431 is about 3521.8505079006. The cubic root of 12403431 is about 231.4802512126.

Adding to 12403431 its reverse (13430421), we get a palindrome (25833852).

The spelling of 12403431 in words is "twelve million, four hundred three thousand, four hundred thirty-one".