26440401431 has 4 divisors (see below), whose sum is σ = 26440748664. Its totient is φ = 26440054200.

The previous prime is 26440401413. The next prime is 26440401443. The reversal of 26440401431 is 13410404462.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26440401431 is a prime.

It is a super-2 number, since 2×26440401431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26440401394 and 26440401403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26440401331) 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, 4460 + ... + 230001.

It is an arithmetic number, because the mean of its divisors is an integer number (6610187166).

Almost surely, 2^26440401431 is an apocalyptic number.

26440401431 is a deficient number, since it is larger than the sum of its proper divisors (347233).

26440401431 is a wasteful number, since it uses less digits than its factorization.

26440401431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347232.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 26440401431 its reverse (13410404462), we get a palindrome (39850805893).

The spelling of 26440401431 in words is "twenty-six billion, four hundred forty million, four hundred one thousand, four hundred thirty-one".