812138929 has 4 divisors (see below), whose sum is σ = 928158784. Its totient is φ = 696119076.

The previous prime is 812138927. The next prime is 812138941. The reversal of 812138929 is 929831218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 812138929 - 2¹ = 812138927 is a prime.

It is not an unprimeable number, because it can be changed into a prime (812138923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58009917 + ... + 58009930.

It is an arithmetic number, because the mean of its divisors is an integer number (232039696).

Almost surely, 2^812138929 is an apocalyptic number.

It is an amenable number.

812138929 is a deficient number, since it is larger than the sum of its proper divisors (116019855).

812138929 is a wasteful number, since it uses less digits than its factorization.

812138929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116019854.

The product of its digits is 62208, while the sum is 43.

The square root of 812138929 is about 28498.0513193446. The cubic root of 812138929 is about 932.9895429251.

The spelling of 812138929 in words is "eight hundred twelve million, one hundred thirty-eight thousand, nine hundred twenty-nine".