9988761 has 4 divisors (see below), whose sum is σ = 13318352.
Its totient is φ = 6659172.
The previous prime is 9988757. The next prime is 9988793. The reversal of 9988761 is 1678899.
It can be divided in two parts, 998 and 8761, that multiplied together give a palindrome (8743478).
It is a happy number.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1678899 = 3 ⋅559633.
It is not a de Polignac number, because 9988761 - 22 = 9988757 is a prime.
It is the 3161-st Hogben number.
It is a Duffinian number.
It is a Curzon number.
It is a nialpdrome in base 10.
It is a self number, because there is not a number n which added to its sum of digits gives 9988761.
It is not an unprimeable number, because it can be changed into a prime (9988711) by changing a digit.
It is a nontrivial repunit in base 3160.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1664791 + ... + 1664796.
It is an arithmetic number, because the mean of its divisors is an integer number (3329588).
Almost surely, 29988761 is an apocalyptic number.
It is an amenable number.
9988761 is a deficient number, since it is larger than the sum of its proper divisors (3329591).
9988761 is a wasteful number, since it uses less digits than its factorization.
9988761 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3329590.
The product of its digits is 217728, while the sum is 48.
The square root of 9988761 is about 3160.5001186521.
The cubic root of 9988761 is about 215.3627264418.
The spelling of 9988761 in words is "nine million, nine hundred eighty-eight thousand, seven hundred sixty-one".