9988312 has 8 divisors (see below), whose sum is σ = 18728100. Its totient is φ = 4994152.

The previous prime is 9988309. The next prime is 9988313. The reversal of 9988312 is 2138899.

It is a tau number, because it is divible by the number of its divisors (8).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9988313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624262 + ... + 624277.

Almost surely, 2^9988312 is an apocalyptic number.

It is an amenable number.

9988312 is a deficient number, since it is larger than the sum of its proper divisors (8739788).

9988312 is a wasteful number, since it uses less digits than its factorization.

9988312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248545 (or 1248541 counting only the distinct ones).

The product of its digits is 31104, while the sum is 40.

The square root of 9988312 is about 3160.4290847921. The cubic root of 9988312 is about 215.3594995046.

It can be divided in two parts, 9988 and 312, that multiplied together give a triangular number (3116256 = T₂₄₉₆).

The spelling of 9988312 in words is "nine million, nine hundred eighty-eight thousand, three hundred twelve".