805247 has 4 divisors (see below), whose sum is σ = 815520. Its totient is φ = 794976.

The previous prime is 805241. The next prime is 805249. The reversal of 805247 is 742508.

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

It is a cyclic number.

It is not a de Polignac number, because 805247 - 2¹⁴ = 788863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 805247.

It is not an unprimeable number, because it can be changed into a prime (805241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5018 + ... + 5175.

It is an arithmetic number, because the mean of its divisors is an integer number (203880).

2⁸⁰⁵²⁴⁷ is an apocalyptic number.

805247 is a deficient number, since it is larger than the sum of its proper divisors (10273).

805247 is a wasteful number, since it uses less digits than its factorization.

805247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10272.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 805247 is about 897.3555594078. The cubic root of 805247 is about 93.0342880467.

The spelling of 805247 in words is "eight hundred five thousand, two hundred forty-seven".