306812 has 24 divisors (see below), whose sum is σ = 618240. Its totient is φ = 131760.

The previous prime is 306809. The next prime is 306821. The reversal of 306812 is 218603.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 306812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 653 + ... + 1019.

It is an arithmetic number, because the mean of its divisors is an integer number (25760).

2³⁰⁶⁸¹² is an apocalyptic number.

It is an amenable number.

306812 is an abundant number, since it is smaller than the sum of its proper divisors (311428).

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

306812 is a wasteful number, since it uses less digits than its factorization.

306812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401 (or 399 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 306812 is about 553.9061292313. The cubic root of 306812 is about 67.4461939753.

Subtracting from 306812 its reverse (218603), we obtain a square (88209 = 297²).

The spelling of 306812 in words is "three hundred six thousand, eight hundred twelve".