812820727 has 4 divisors (see below), whose sum is σ = 812936376. Its totient is φ = 812705080.

The previous prime is 812820721. The next prime is 812820731. The reversal of 812820727 is 727028218.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 812820727 - 2³ = 812820719 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 (812820721) 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, 46549 + ... + 61582.

It is an arithmetic number, because the mean of its divisors is an integer number (203234094).

Almost surely, 2^812820727 is an apocalyptic number.

812820727 is a deficient number, since it is larger than the sum of its proper divisors (115649).

812820727 is a wasteful number, since it uses less digits than its factorization.

812820727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115648.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 812820727 is about 28510.0109961396. The cubic root of 812820727 is about 933.2505542939.

The spelling of 812820727 in words is "eight hundred twelve million, eight hundred twenty thousand, seven hundred twenty-seven".