9281988 has 36 divisors (see below), whose sum is σ = 23734620. Its totient is φ = 3058176.

The previous prime is 9281977. The next prime is 9281999. The reversal of 9281988 is 8891829.

It is an interprime number because it is at equal distance from previous prime (9281977) and next prime (9281999).

It can be written as a sum of positive squares in 2 ways, for example, as 1397124 + 7884864 = 1182^2 + 2808^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1756 + ... + 4652.

It is an arithmetic number, because the mean of its divisors is an integer number (659295).

Almost surely, 2^9281988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9281988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11867310).

9281988 is an abundant number, since it is smaller than the sum of its proper divisors (14452632).

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

9281988 is a wasteful number, since it uses less digits than its factorization.

9281988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2996 (or 2991 counting only the distinct ones).

The product of its digits is 82944, while the sum is 45.

The square root of 9281988 is about 3046.6355213579. The cubic root of 9281988 is about 210.1585197661.

It can be divided in two parts, 928 and 1988, that added together give a square (2916 = 54²).

The spelling of 9281988 in words is "nine million, two hundred eighty-one thousand, nine hundred eighty-eight".