812129838 has 32 divisors (see below), whose sum is σ = 1759581600. Its totient is φ = 249882048.

The previous prime is 812129837. The next prime is 812129849. The reversal of 812129838 is 838921218.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 812129838.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812129837) 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 in 15 ways as a sum of consecutive naturals, for example, 17623 + ... + 43986.

It is an arithmetic number, because the mean of its divisors is an integer number (54986925).

Almost surely, 2^812129838 is an apocalyptic number.

812129838 is an abundant number, since it is smaller than the sum of its proper divisors (947451762).

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

812129838 is a wasteful number, since it uses less digits than its factorization.

812129838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61653 (or 61627 counting only the distinct ones).

The product of its digits is 55296, while the sum is 42.

The square root of 812129838 is about 28497.8918167643. The cubic root of 812129838 is about 932.9860616490.

The spelling of 812129838 in words is "eight hundred twelve million, one hundred twenty-nine thousand, eight hundred thirty-eight".