308920 has 16 divisors (see below), whose sum is σ = 695160. Its totient is φ = 123552.

The previous prime is 308899. The next prime is 308923. The reversal of 308920 is 29803.

308920 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 308891 and 308900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (308923) by changing a digit.

308920 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, 3822 + ... + 3901.

2³⁰⁸⁹²⁰ is an apocalyptic number.

It is an amenable number.

308920 is an abundant number, since it is smaller than the sum of its proper divisors (386240).

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

308920 is a wasteful number, since it uses less digits than its factorization.

308920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7734 (or 7730 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 308920 is about 555.8057214531. The cubic root of 308920 is about 67.6003081111.

The spelling of 308920 in words is "three hundred eight thousand, nine hundred twenty".