13005947 has 4 divisors (see below), whose sum is σ = 13015920. Its totient is φ = 12995976.

The previous prime is 13005931. The next prime is 13005997. The reversal of 13005947 is 74950031.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13005947 - 2⁴ = 13005931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13005917) 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, 2672 + ... + 5757.

It is an arithmetic number, because the mean of its divisors is an integer number (3253980).

Almost surely, 2^13005947 is an apocalyptic number.

13005947 is a deficient number, since it is larger than the sum of its proper divisors (9973).

13005947 is an equidigital number, since it uses as much as digits as its factorization.

13005947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9972.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 13005947 is about 3606.3758816851. The cubic root of 13005947 is about 235.1693181455.

Adding to 13005947 its reverse (74950031), we get a palindrome (87955978).

The spelling of 13005947 in words is "thirteen million, five thousand, nine hundred forty-seven".