9911887 has 8 divisors (see below), whose sum is σ = 10186704. Its totient is φ = 9639168.

The previous prime is 9911861. The next prime is 9911917. The reversal of 9911887 is 7881199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9911887 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9911857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14853 + ... + 15505.

It is an arithmetic number, because the mean of its divisors is an integer number (1273338).

Almost surely, 2^9911887 is an apocalyptic number.

9911887 is a deficient number, since it is larger than the sum of its proper divisors (274817).

9911887 is a wasteful number, since it uses less digits than its factorization.

9911887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049.

The product of its digits is 36288, while the sum is 43.

The square root of 9911887 is about 3148.3149461259. The cubic root of 9911887 is about 214.8088223035.

The spelling of 9911887 in words is "nine million, nine hundred eleven thousand, eight hundred eighty-seven".