308840 has 32 divisors (see below), whose sum is σ = 794880. Its totient is φ = 105792.

The previous prime is 308827. The next prime is 308849. The reversal of 308840 is 48803.

It is a Smith number, since the sum of its digits (23) coincides with the sum of the digits of its prime factors.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 308840.

It is not an unprimeable number, because it can be changed into a prime (308849) by changing a digit.

308840 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 7 ways as a sum of consecutive naturals, for example, 272 + ... + 831.

It is an arithmetic number, because the mean of its divisors is an integer number (24840).

2³⁰⁸⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

308840 is an abundant number, since it is smaller than the sum of its proper divisors (486040).

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

308840 is a wasteful number, since it uses less digits than its factorization.

308840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121 (or 1117 counting only the distinct ones).

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

The square root of 308840 is about 555.7337492001. The cubic root of 308840 is about 67.5944721972.

The spelling of 308840 in words is "three hundred eight thousand, eight hundred forty".