13215405 has 32 divisors (see below), whose sum is σ = 24735744. Its totient is φ = 5898816.

The previous prime is 13215383. The next prime is 13215421. The reversal of 13215405 is 50451231.

13215405 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13215405 - 2⁷ = 13215277 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 31 ways as a sum of consecutive naturals, for example, 3052 + ... + 5978.

It is an arithmetic number, because the mean of its divisors is an integer number (772992).

Almost surely, 2^13215405 is an apocalyptic number.

13215405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13215405 is a deficient number, since it is larger than the sum of its proper divisors (11520339).

13215405 is a wasteful number, since it uses less digits than its factorization.

13215405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2985.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 13215405 is about 3635.2998500811. The cubic root of 13215405 is about 236.4250515279.

Adding to 13215405 its reverse (50451231), we get a palindrome (63666636).

The spelling of 13215405 in words is "thirteen million, two hundred fifteen thousand, four hundred five".