812476821 has 16 divisors (see below), whose sum is σ = 1198166144. Its totient is φ = 486471744.

The previous prime is 812476783. The next prime is 812476837. The reversal of 812476821 is 128674218.

It is a happy number.

812476821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 812476821 - 2⁶ = 812476757 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 812476821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812476871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280081 + ... + 282966.

It is an arithmetic number, because the mean of its divisors is an integer number (74885384).

Almost surely, 2^812476821 is an apocalyptic number.

It is an amenable number.

812476821 is a deficient number, since it is larger than the sum of its proper divisors (385689323).

812476821 is a wasteful number, since it uses less digits than its factorization.

812476821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563100.

The product of its digits is 43008, while the sum is 39.

The square root of 812476821 is about 28503.9790380220. The cubic root of 812476821 is about 933.1189156967.

The spelling of 812476821 in words is "eight hundred twelve million, four hundred seventy-six thousand, eight hundred twenty-one".