9887391 has 24 divisors (see below), whose sum is σ = 15275520. Its totient is φ = 6144336.

The previous prime is 9887363. The next prime is 9887393. The reversal of 9887391 is 1937889.

It is not a de Polignac number, because 9887391 - 2⁵ = 9887359 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9887393) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11026 + ... + 11888.

It is an arithmetic number, because the mean of its divisors is an integer number (636480).

Almost surely, 2^9887391 is an apocalyptic number.

9887391 is a deficient number, since it is larger than the sum of its proper divisors (5388129).

9887391 is a wasteful number, since it uses less digits than its factorization.

9887391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955 (or 952 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 9887391 is about 3144.4222044757. The cubic root of 9887391 is about 214.6317185347.

The spelling of 9887391 in words is "nine million, eight hundred eighty-seven thousand, three hundred ninety-one".