13540040405 has 16 divisors (see below), whose sum is σ = 17797054320. Its totient is φ = 9843305472.

The previous prime is 13540040401. The next prime is 13540040419. The reversal of 13540040405 is 50404004531.

It can be written as a sum of positive squares in 8 ways, for example, as 41550916 + 13498489489 = 6446^2 + 116183^2 .

It is a cyclic number.

It is not a de Polignac number, because 13540040405 - 2² = 13540040401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13540040401) 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, 2743994 + ... + 2748923.

It is an arithmetic number, because the mean of its divisors is an integer number (1112315895).

Almost surely, 2^13540040405 is an apocalyptic number.

It is an amenable number.

13540040405 is a deficient number, since it is larger than the sum of its proper divisors (4257013915).

13540040405 is a wasteful number, since it uses less digits than its factorization.

13540040405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5492968.

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 13540040405 its reverse (50404004531), we get a palindrome (63944044936).

The spelling of 13540040405 in words is "thirteen billion, five hundred forty million, forty thousand, four hundred five".