812909805838 has 8 divisors (see below), whose sum is σ = 1313161994088. Its totient is φ = 375189141144.

The previous prime is 812909805833. The next prime is 812909805863. The reversal of 812909805838 is 838508909218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812909805833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15632880856 + ... + 15632880907.

It is an arithmetic number, because the mean of its divisors is an integer number (164145249261).

Almost surely, 2^812909805838 is an apocalyptic number.

812909805838 is a deficient number, since it is larger than the sum of its proper divisors (500252188250).

812909805838 is a wasteful number, since it uses less digits than its factorization.

812909805838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31265761778.

The product of its (nonzero) digits is 9953280, while the sum is 61.

The spelling of 812909805838 in words is "eight hundred twelve billion, nine hundred nine million, eight hundred five thousand, eight hundred thirty-eight".