9911947 has 4 divisors (see below), whose sum is σ = 9933120. Its totient is φ = 9890776.

The previous prime is 9911929. The next prime is 9911953. The reversal of 9911947 is 7491199.

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 9911947 - 2¹⁵ = 9879179 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

9911947 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9911917) 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, 9868 + ... + 10825.

It is an arithmetic number, because the mean of its divisors is an integer number (2483280).

Almost surely, 2^9911947 is an apocalyptic number.

9911947 is a deficient number, since it is larger than the sum of its proper divisors (21173).

9911947 is a wasteful number, since it uses less digits than its factorization.

9911947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21172.

The product of its digits is 20412, while the sum is 40.

The square root of 9911947 is about 3148.3244750184. The cubic root of 9911947 is about 214.8092557394.

The spelling of 9911947 in words is "nine million, nine hundred eleven thousand, nine hundred forty-seven".