805087 has 4 divisors (see below), whose sum is σ = 847480. Its totient is φ = 762696.

The previous prime is 805081. The next prime is 805097. The reversal of 805087 is 780508.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-805087 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21168 + ... + 21205.

It is an arithmetic number, because the mean of its divisors is an integer number (211870).

2⁸⁰⁵⁰⁸⁷ is an apocalyptic number.

805087 is a deficient number, since it is larger than the sum of its proper divisors (42393).

805087 is a wasteful number, since it uses less digits than its factorization.

805087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42392.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 805087 is about 897.2664041409. The cubic root of 805087 is about 93.0281257668.

The spelling of 805087 in words is "eight hundred five thousand, eighty-seven".