840099 has 12 divisors (see below), whose sum is σ = 1213656. Its totient is φ = 516672.

The previous prime is 840083. The next prime is 840109. The reversal of 840099 is 990048.

840099 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 840099 - 2⁴ = 840083 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

840099 is a modest number, since divided by 99 gives 84 as remainder.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 840099.

It is not an unprimeable number, because it can be changed into a prime (840299) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 322 + ... + 1335.

It is an arithmetic number, because the mean of its divisors is an integer number (101138).

2⁸⁴⁰⁰⁹⁹ is an apocalyptic number.

840099 is a deficient number, since it is larger than the sum of its proper divisors (373557).

840099 is a wasteful number, since it uses less digits than its factorization.

840099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686 (or 1673 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 840099 is about 916.5691463278. The cubic root of 840099 is about 94.3575862203.

The spelling of 840099 in words is "eight hundred forty thousand, ninety-nine".