9987579 has 24 divisors (see below), whose sum is σ = 16773120. Its totient is φ = 5608368.

The previous prime is 9987577. The next prime is 9987617. The reversal of 9987579 is 9757899.

It is not a de Polignac number, because 9987579 - 2¹ = 9987577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9987577) 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, 2374 + ... + 5060.

It is an arithmetic number, because the mean of its divisors is an integer number (698880).

Almost surely, 2^9987579 is an apocalyptic number.

9987579 is a deficient number, since it is larger than the sum of its proper divisors (6785541).

9987579 is a wasteful number, since it uses less digits than its factorization.

9987579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2759 (or 2756 counting only the distinct ones).

The product of its digits is 1428840, while the sum is 54.

The square root of 9987579 is about 3160.3131173983. The cubic root of 9987579 is about 215.3542312680.

It can be divided in two parts, 99 and 87579, that added together give a palindrome (87678).

The spelling of 9987579 in words is "nine million, nine hundred eighty-seven thousand, five hundred seventy-nine".