999000840 has 32 divisors (see below), whose sum is σ = 2997002880. Its totient is φ = 266400192.

The previous prime is 999000817. The next prime is 999000841. The reversal of 999000840 is 48000999.

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 not an unprimeable number, because it can be changed into a prime (999000841) 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, 4162384 + ... + 4162623.

It is an arithmetic number, because the mean of its divisors is an integer number (93656340).

Almost surely, 2^999000840 is an apocalyptic number.

It is an amenable number.

999000840 is an abundant number, since it is smaller than the sum of its proper divisors (1998002040).

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

999000840 is a wasteful number, since it uses less digits than its factorization.

999000840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8325021 (or 8325017 counting only the distinct ones).

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

The square root of 999000840 is about 31606.9745467674. The cubic root of 999000840 is about 999.6668356805. Note that the first 3 decimals are identical.

The spelling of 999000840 in words is "nine hundred ninety-nine million, eight hundred forty", and thus it is an aban number.