812008188 has 36 divisors (see below), whose sum is σ = 2053783368. Its totient is φ = 270510240.

The previous prime is 812008121. The next prime is 812008189. The reversal of 812008188 is 881800218.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812008189) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66478 + ... + 77738.

It is an arithmetic number, because the mean of its divisors is an integer number (57049538).

Almost surely, 2^812008188 is an apocalyptic number.

It is an amenable number.

812008188 is an abundant number, since it is smaller than the sum of its proper divisors (1241775180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

812008188 is a wasteful number, since it uses less digits than its factorization.

812008188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13274 (or 13269 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 36.

The square root of 812008188 is about 28495.7573684224. The cubic root of 812008188 is about 932.9394749184.

The spelling of 812008188 in words is "eight hundred twelve million, eight thousand, one hundred eighty-eight".