905812 has 6 divisors (see below), whose sum is σ = 1585178. Its totient is φ = 452904.

The previous prime is 905803. The next prime is 905819. The reversal of 905812 is 218509.

905812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 715716 + 190096 = 846^2 + 436^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (905819) by changing a digit.

905812 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 as a sum of consecutive naturals, namely, 113223 + ... + 113230.

2⁹⁰⁵⁸¹² is an apocalyptic number.

It is an amenable number.

905812 is a deficient number, since it is larger than the sum of its proper divisors (679366).

905812 is a wasteful number, since it uses less digits than its factorization.

905812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226457 (or 226455 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 905812 is about 951.7415615596. The cubic root of 905812 is about 96.7563232140.

The spelling of 905812 in words is "nine hundred five thousand, eight hundred twelve".