8999040 has 128 divisors (see below), whose sum is σ = 29620800. Its totient is φ = 2322432.

The previous prime is 8999033. The next prime is 8999047. The reversal of 8999040 is 409998.

It is an interprime number because it is at equal distance from previous prime (8999033) and next prime (8999047).

It is a tau number, because it is divible by the number of its divisors (128).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 8999040.

It is not an unprimeable number, because it can be changed into a prime (8999047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82506 + ... + 82614.

Almost surely, 2^8999040 is an apocalyptic number.

8999040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8999040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14810400).

8999040 is an abundant number, since it is smaller than the sum of its proper divisors (20621760).

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

8999040 is a wasteful number, since it uses less digits than its factorization.

8999040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 8999040 is about 2999.8399957331. The cubic root of 8999040 is about 208.0009861886. Note that the first 3 decimals are identical.

The spelling of 8999040 in words is "eight million, nine hundred ninety-nine thousand, forty".