9987158 has 4 divisors (see below), whose sum is σ = 14980740. Its totient is φ = 4993578.

The previous prime is 9987157. The next prime is 9987181. The reversal of 9987158 is 8517899.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8517899 = 13 ⋅655223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9987157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2496788 + ... + 2496791.

It is an arithmetic number, because the mean of its divisors is an integer number (3745185).

Almost surely, 2^9987158 is an apocalyptic number.

9987158 is a deficient number, since it is larger than the sum of its proper divisors (4993582).

9987158 is a wasteful number, since it uses less digits than its factorization.

9987158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4993581.

The product of its digits is 181440, while the sum is 47.

The square root of 9987158 is about 3160.2465093723. The cubic root of 9987158 is about 215.3512053293.

The spelling of 9987158 in words is "nine million, nine hundred eighty-seven thousand, one hundred fifty-eight".