840308 has 12 divisors (see below), whose sum is σ = 1680672. Its totient is φ = 360120.

The previous prime is 840299. The next prime is 840319. The reversal of 840308 is 803048.

840308 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

840308 is an admirable number.

It is a super-2 number, since 2×840308² = 1412235069728, which contains 22 as substring.

840308 is a modest number, since divided by 308 gives 84 as remainder.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 840308.

It is an unprimeable number.

840308 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14978 + ... + 15033.

It is an arithmetic number, because the mean of its divisors is an integer number (140056).

2⁸⁴⁰³⁰⁸ is an apocalyptic number.

It is an amenable number.

840308 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

840308 is a wasteful number, since it uses less digits than its factorization.

840308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30022 (or 30020 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 840308 is about 916.6831513669. The cubic root of 840308 is about 94.3654103380.

The spelling of 840308 in words is "eight hundred forty thousand, three hundred eight".