306840 has 32 divisors (see below), whose sum is σ = 920880. Its totient is φ = 81792.

The previous prime is 306829. The next prime is 306847. The reversal of 306840 is 48603.

306840 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306847) 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, 1159 + ... + 1398.

2³⁰⁶⁸⁴⁰ is an apocalyptic number.

306840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

306840 is an abundant number, since it is smaller than the sum of its proper divisors (614040).

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

306840 is a wasteful number, since it uses less digits than its factorization.

306840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2571 (or 2567 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 306840 is about 553.9314036954. The cubic root of 306840 is about 67.4482456508.

The spelling of 306840 in words is "three hundred six thousand, eight hundred forty".