812506447 has 4 divisors (see below), whose sum is σ = 812575120. Its totient is φ = 812437776.

The previous prime is 812506439. The next prime is 812506451. The reversal of 812506447 is 744605218.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 812506447 - 2³ = 812506439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812506477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11547 + ... + 41932.

It is an arithmetic number, because the mean of its divisors is an integer number (203143780).

Almost surely, 2^812506447 is an apocalyptic number.

812506447 is a deficient number, since it is larger than the sum of its proper divisors (68673).

812506447 is a wasteful number, since it uses less digits than its factorization.

812506447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68672.

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 812506447 is about 28504.4987151151. The cubic root of 812506447 is about 933.1302572490.

The spelling of 812506447 in words is "eight hundred twelve million, five hundred six thousand, four hundred forty-seven".