13405947 has 4 divisors (see below), whose sum is σ = 17874600. Its totient is φ = 8937296.

The previous prime is 13405927. The next prime is 13405957. The reversal of 13405947 is 74950431.

13405947 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.

It is a cyclic number.

It is not a de Polignac number, because 13405947 - 2¹⁵ = 13373179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13405927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2234322 + ... + 2234327.

It is an arithmetic number, because the mean of its divisors is an integer number (4468650).

Almost surely, 2^13405947 is an apocalyptic number.

13405947 is a deficient number, since it is larger than the sum of its proper divisors (4468653).

13405947 is an equidigital number, since it uses as much as digits as its factorization.

13405947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4468652.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 13405947 is about 3661.4132517376. The cubic root of 13405947 is about 237.5559063218. Note that the first 3 decimals are identical.

The spelling of 13405947 in words is "thirteen million, four hundred five thousand, nine hundred forty-seven".