13240431 has 12 divisors (see below), whose sum is σ = 19570408. Its totient is φ = 8621424.

The previous prime is 13240421. The next prime is 13240453. The reversal of 13240431 is 13404231.

It is not a de Polignac number, because 13240431 - 2⁷ = 13240303 is a prime.

It is a super-2 number, since 2×13240431² = 350618026131522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13240421) 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 11 ways as a sum of consecutive naturals, for example, 16720 + ... + 17493.

Almost surely, 2^13240431 is an apocalyptic number.

13240431 is a deficient number, since it is larger than the sum of its proper divisors (6329977).

13240431 is a wasteful number, since it uses less digits than its factorization.

13240431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34262 (or 34259 counting only the distinct ones).

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

The square root of 13240431 is about 3638.7403040063. The cubic root of 13240431 is about 236.5741967212.

Adding to 13240431 its reverse (13404231), we get a palindrome (26644662).

The spelling of 13240431 in words is "thirteen million, two hundred forty thousand, four hundred thirty-one".