13504405 has 4 divisors (see below), whose sum is σ = 16205292. Its totient is φ = 10803520.

The previous prime is 13504399. The next prime is 13504411. The reversal of 13504405 is 50440531.

13504405 = 2598² + 2599².

13504405 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50440531 = 2411 ⋅20921.

It is an interprime number because it is at equal distance from previous prime (13504399) and next prime (13504411).

It can be written as a sum of positive squares in 2 ways, for example, as 6749604 + 6754801 = 2598^2 + 2599^2 .

It is not a de Polignac number, because 13504405 - 2⁷ = 13504277 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 1350436 + ... + 1350445.

It is an arithmetic number, because the mean of its divisors is an integer number (4051323).

Almost surely, 2^13504405 is an apocalyptic number.

13504405 is the 2599-th centered square number.

It is an amenable number.

13504405 is a deficient number, since it is larger than the sum of its proper divisors (2700887).

13504405 is an equidigital number, since it uses as much as digits as its factorization.

13504405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2700886.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 13504405 is about 3674.8340098568. The cubic root of 13504405 is about 238.1360531331.

Adding to 13504405 its reverse (50440531), we get a palindrome (63944936).

The spelling of 13504405 in words is "thirteen million, five hundred four thousand, four hundred five".