9987798 has 8 divisors (see below), whose sum is σ = 19975608. Its totient is φ = 3329264.

The previous prime is 9987793. The next prime is 9987827. The reversal of 9987798 is 8977899.

It is a happy number.

9987798 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

9987798 is an admirable number.

It is a super-2 number, since 2×9987798² = 199512217777608, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9987793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 832311 + ... + 832322.

It is an arithmetic number, because the mean of its divisors is an integer number (2496951).

Almost surely, 2^9987798 is an apocalyptic number.

9987798 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9987798 is a wasteful number, since it uses less digits than its factorization.

9987798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664638.

The product of its digits is 2286144, while the sum is 57.

The square root of 9987798 is about 3160.3477656739. The cubic root of 9987798 is about 215.3558052975.

The spelling of 9987798 in words is "nine million, nine hundred eighty-seven thousand, seven hundred ninety-eight".