812123536 has 40 divisors (see below), whose sum is σ = 1892924480. Its totient is φ = 329733504.

The previous prime is 812123503. The next prime is 812123551. The reversal of 812123536 is 635321218.

It is a junction number, because it is equal to n+sod(n) for n = 812123498 and 812123507.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188691 + ... + 192946.

It is an arithmetic number, because the mean of its divisors is an integer number (47323112).

Almost surely, 2^812123536 is an apocalyptic number.

It is an amenable number.

812123536 is an abundant number, since it is smaller than the sum of its proper divisors (1080800944).

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

812123536 is a wasteful number, since it uses less digits than its factorization.

812123536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381671 (or 381665 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 812123536 is about 28497.7812469673. The cubic root of 812123536 is about 932.9836483676.

It can be divided in two parts, 81212 and 3536, that added together give a palindrome (84748).

The spelling of 812123536 in words is "eight hundred twelve million, one hundred twenty-three thousand, five hundred thirty-six".