13040440431 has 16 divisors (see below), whose sum is σ = 17457218688. Its totient is φ = 8658698400.

The previous prime is 13040440421. The next prime is 13040440499. The reversal of 13040440431 is 13404404031.

It is a de Polignac number, because none of the positive numbers 2^k-13040440431 is a prime.

It is a super-2 number, since 2×13040440431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13040440421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1077345 + ... + 1089381.

It is an arithmetic number, because the mean of its divisors is an integer number (1091076168).

Almost surely, 2^13040440431 is an apocalyptic number.

13040440431 is a deficient number, since it is larger than the sum of its proper divisors (4416778257).

13040440431 is a wasteful number, since it uses less digits than its factorization.

13040440431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13462.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 13040440431 its reverse (13404404031), we get a palindrome (26444844462).

The spelling of 13040440431 in words is "thirteen billion, forty million, four hundred forty thousand, four hundred thirty-one".