11718947 has 4 divisors (see below), whose sum is σ = 11730816. Its totient is φ = 11707080.

The previous prime is 11718923. The next prime is 11718977. The reversal of 11718947 is 74981711.

It is a happy number.

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 11718947 - 2⁸ = 11718691 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11718947.

It is not an unprimeable number, because it can be changed into a prime (11718977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4304 + ... + 6477.

It is an arithmetic number, because the mean of its divisors is an integer number (2932704).

Almost surely, 2^11718947 is an apocalyptic number.

11718947 is a deficient number, since it is larger than the sum of its proper divisors (11869).

11718947 is a wasteful number, since it uses less digits than its factorization.

11718947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11868.

The product of its digits is 14112, while the sum is 38.

The square root of 11718947 is about 3423.2947579781. The cubic root of 11718947 is about 227.1413468889.

The spelling of 11718947 in words is "eleven million, seven hundred eighteen thousand, nine hundred forty-seven".