305812 has 12 divisors (see below), whose sum is σ = 576436. Its totient is φ = 141120.

The previous prime is 305803. The next prime is 305821. The reversal of 305812 is 218503.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (305803) and next prime (305821).

It can be written as a sum of positive squares in 2 ways, for example, as 148996 + 156816 = 386^2 + 396^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 305812.

It is a congruent number.

It is an unprimeable number.

305812 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, 2889 + ... + 2992.

2³⁰⁵⁸¹² is an apocalyptic number.

It is an amenable number.

305812 is a deficient number, since it is larger than the sum of its proper divisors (270624).

305812 is a wasteful number, since it uses less digits than its factorization.

305812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5898 (or 5896 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 305812 is about 553.0027124707. The cubic root of 305812 is about 67.3728378666.

The spelling of 305812 in words is "three hundred five thousand, eight hundred twelve".