13400405 has 16 divisors (see below), whose sum is σ = 16588800. Its totient is φ = 10386432.

The previous prime is 13400389. The next prime is 13400417. The reversal of 13400405 is 50400431.

It is a cyclic number.

It is not a de Polignac number, because 13400405 - 2⁴ = 13400389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29621 + ... + 30069.

It is an arithmetic number, because the mean of its divisors is an integer number (1036800).

Almost surely, 2^13400405 is an apocalyptic number.

It is an amenable number.

13400405 is a deficient number, since it is larger than the sum of its proper divisors (3188395).

13400405 is a wasteful number, since it uses less digits than its factorization.

13400405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 13400405 is about 3660.6563619111. The cubic root of 13400405 is about 237.5231667152.

Adding to 13400405 its reverse (50400431), we get a palindrome (63800836).

The spelling of 13400405 in words is "thirteen million, four hundred thousand, four hundred five".