805138 has 12 divisors (see below), whose sum is σ = 1264158. Its totient is φ = 384560.

The previous prime is 805121. The next prime is 805153. The reversal of 805138 is 831508.

It can be written as a sum of positive squares in only one way, i.e., 804609 + 529 = 897^2 + 23^2 .

It is an unprimeable number.

805138 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 678 + ... + 1438.

2⁸⁰⁵¹³⁸ is an apocalyptic number.

805138 is a deficient number, since it is larger than the sum of its proper divisors (459020).

805138 is a wasteful number, since it uses less digits than its factorization.

805138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809 (or 786 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 805138 is about 897.2948233440. The cubic root of 805138 is about 93.0300900822.

The spelling of 805138 in words is "eight hundred five thousand, one hundred thirty-eight".