9987279 has 16 divisors (see below), whose sum is σ = 14232672. Its totient is φ = 6207488.

The previous prime is 9987253. The next prime is 9987283. The reversal of 9987279 is 9727899.

It is a happy number.

9987279 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 9987279 - 2⁵ = 9987247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

9987279 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9987209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4897 + ... + 6629.

It is an arithmetic number, because the mean of its divisors is an integer number (889542).

Almost surely, 2^9987279 is an apocalyptic number.

9987279 is a deficient number, since it is larger than the sum of its proper divisors (4245393).

9987279 is a wasteful number, since it uses less digits than its factorization.

9987279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1866.

The product of its digits is 571536, while the sum is 51.

The square root of 9987279 is about 3160.2656533906. The cubic root of 9987279 is about 215.3520750258.

It can be divided in two parts, 99 and 87279, that added together give a palindrome (87378).

The spelling of 9987279 in words is "nine million, nine hundred eighty-seven thousand, two hundred seventy-nine".