805138791 has 8 divisors (see below), whose sum is σ = 1073737200. Its totient is φ = 536649792.

The previous prime is 805138783. The next prime is 805138843. The reversal of 805138791 is 197831508.

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

It is not a de Polignac number, because 805138791 - 2³ = 805138783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805138591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8280 + ... + 40973.

It is an arithmetic number, because the mean of its divisors is an integer number (134217150).

Almost surely, 2^805138791 is an apocalyptic number.

805138791 is a deficient number, since it is larger than the sum of its proper divisors (268598409).

805138791 is a wasteful number, since it uses less digits than its factorization.

805138791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54705.

The product of its (nonzero) digits is 60480, while the sum is 42.

The square root of 805138791 is about 28374.9676828010. The cubic root of 805138791 is about 930.3012054768.

The spelling of 805138791 in words is "eight hundred five million, one hundred thirty-eight thousand, seven hundred ninety-one".