13440905 has 4 divisors (see below), whose sum is σ = 16129092. Its totient is φ = 10752720.

The previous prime is 13440893. The next prime is 13440929. The reversal of 13440905 is 50904431.

13440905 is digitally balanced in base 2, 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: 50904431 = 47 ⋅1083073.

It can be written as a sum of positive squares in 2 ways, for example, as 9815689 + 3625216 = 3133^2 + 1904^2 .

It is not a de Polignac number, because 13440905 - 2²⁰ = 12392329 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1344086 + ... + 1344095.

It is an arithmetic number, because the mean of its divisors is an integer number (4032273).

Almost surely, 2^13440905 is an apocalyptic number.

It is an amenable number.

13440905 is a deficient number, since it is larger than the sum of its proper divisors (2688187).

13440905 is an equidigital number, since it uses as much as digits as its factorization.

13440905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2688186.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 13440905 is about 3666.1839833811. The cubic root of 13440905 is about 237.7622145477.

The spelling of 13440905 in words is "thirteen million, four hundred forty thousand, nine hundred five".