813838158 has 80 divisors (see below), whose sum is σ = 2110161360. Its totient is φ = 232488144.

The previous prime is 813838147. The next prime is 813838169. The reversal of 813838158 is 851838318.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (813838147) and next prime (813838169).

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 126516 + ... + 132792.

It is an arithmetic number, because the mean of its divisors is an integer number (26377017).

Almost surely, 2^813838158 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 813838158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1055080680).

813838158 is an abundant number, since it is smaller than the sum of its proper divisors (1296323202).

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

813838158 is an equidigital number, since it uses as much as digits as its factorization.

813838158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6316 (or 6289 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The square root of 813838158 is about 28527.8488147985. The cubic root of 813838158 is about 933.6397840911.

The spelling of 813838158 in words is "eight hundred thirteen million, eight hundred thirty-eight thousand, one hundred fifty-eight".