8991312 has 40 divisors (see below), whose sum is σ = 25340640. Its totient is φ = 2724480.

The previous prime is 8991299. The next prime is 8991319. The reversal of 8991312 is 2131998.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8991319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7987 + ... + 9042.

It is an arithmetic number, because the mean of its divisors is an integer number (633516).

Almost surely, 2^8991312 is an apocalyptic number.

It is an amenable number.

8991312 is an abundant number, since it is smaller than the sum of its proper divisors (16349328).

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

8991312 is a wasteful number, since it uses less digits than its factorization.

8991312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17051 (or 17045 counting only the distinct ones).

The product of its digits is 3888, while the sum is 33.

The square root of 8991312 is about 2998.5516503806. The cubic root of 8991312 is about 207.9414282812.

It can be divided in two parts, 899 and 1312, that added together give a triangular number (2211 = T₆₆).

The spelling of 8991312 in words is "eight million, nine hundred ninety-one thousand, three hundred twelve".