800858 has 4 divisors (see below), whose sum is σ = 1201290. Its totient is φ = 400428.

The previous prime is 800801. The next prime is 800861. The reversal of 800858 is 858008.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 635209 + 165649 = 797^2 + 407^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 800858.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200213 + ... + 200216.

2⁸⁰⁰⁸⁵⁸ is an apocalyptic number.

800858 is a deficient number, since it is larger than the sum of its proper divisors (400432).

800858 is a wasteful number, since it uses less digits than its factorization.

800858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400431.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 800858 is about 894.9066990474. The cubic root of 800858 is about 92.8649521750.

It can be divided in two parts, 8008 and 58, that multiplied together give a palindrome (464464).

The spelling of 800858 in words is "eight hundred thousand, eight hundred fifty-eight".