305816 has 32 divisors (see below), whose sum is σ = 675840. Its totient is φ = 127008.

The previous prime is 305803. The next prime is 305821. The reversal of 305816 is 618503.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 305791 and 305800.

It is a congruent number.

It is an unprimeable number.

305816 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, 2345 + ... + 2471.

It is an arithmetic number, because the mean of its divisors is an integer number (21120).

2³⁰⁵⁸¹⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 305816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (337920).

305816 is an abundant number, since it is smaller than the sum of its proper divisors (370024).

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

305816 is a wasteful number, since it uses less digits than its factorization.

305816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 305816 is about 553.0063290777. The cubic root of 305816 is about 67.3731316094.

The spelling of 305816 in words is "three hundred five thousand, eight hundred sixteen".