812420408 has 8 divisors (see below), whose sum is σ = 1523288280. Its totient is φ = 406210200.

The previous prime is 812420407. The next prime is 812420417. The reversal of 812420408 is 804024218.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812420407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50776268 + ... + 50776283.

It is an arithmetic number, because the mean of its divisors is an integer number (190411035).

Almost surely, 2^812420408 is an apocalyptic number.

It is an amenable number.

812420408 is a deficient number, since it is larger than the sum of its proper divisors (710867872).

812420408 is a wasteful number, since it uses less digits than its factorization.

812420408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101552557 (or 101552553 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 812420408 is about 28502.9894572482. The cubic root of 812420408 is about 933.0973186680.

The spelling of 812420408 in words is "eight hundred twelve million, four hundred twenty thousand, four hundred eight".