816005 has 8 divisors (see below), whose sum is σ = 984312. Its totient is φ = 649408.

The previous prime is 815989. The next prime is 816019. The reversal of 816005 is 500618.

816005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 98596 + 717409 = 314^2 + 847^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 816005 - 2⁴ = 815989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1187 + ... + 1743.

It is an arithmetic number, because the mean of its divisors is an integer number (123039).

2⁸¹⁶⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

816005 is a deficient number, since it is larger than the sum of its proper divisors (168307).

816005 is a wasteful number, since it uses less digits than its factorization.

816005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 816005 is about 903.3299507932. The cubic root of 816005 is about 93.4467654298.

The spelling of 816005 in words is "eight hundred sixteen thousand, five".