8999840 has 24 divisors (see below), whose sum is σ = 21262500. Its totient is φ = 3599872.

The previous prime is 8999839. The next prime is 8999849. The reversal of 8999840 is 489998.

It can be written as a sum of positive squares in 2 ways, for example, as 8690704 + 309136 = 2948^2 + 556^2 .

It is not an unprimeable number, because it can be changed into a prime (8999849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27965 + ... + 28284.

Almost surely, 2^8999840 is an apocalyptic number.

8999840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8999840 is an abundant number, since it is smaller than the sum of its proper divisors (12262660).

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

8999840 is a wasteful number, since it uses less digits than its factorization.

8999840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56264 (or 56256 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 8999840 is about 2999.9733332148. The cubic root of 8999840 is about 208.0071496556.

The spelling of 8999840 in words is "eight million, nine hundred ninety-nine thousand, eight hundred forty".