864847 has 4 divisors (see below), whose sum is σ = 883296. Its totient is φ = 846400.

The previous prime is 864817. The next prime is 864883. The reversal of 864847 is 748468.

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 864847 - 2¹⁵ = 832079 is a prime.

It is a Duffinian number.

864847 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864817) 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, 9154 + ... + 9247.

It is an arithmetic number, because the mean of its divisors is an integer number (220824).

2⁸⁶⁴⁸⁴⁷ is an apocalyptic number.

864847 is a deficient number, since it is larger than the sum of its proper divisors (18449).

864847 is a wasteful number, since it uses less digits than its factorization.

864847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18448.

The product of its digits is 43008, while the sum is 37.

The square root of 864847 is about 929.9715049398. The cubic root of 864847 is about 95.2751763026.

It can be divided in two parts, 864 and 847, that added together give a triangular number (1711 = T₅₈).

The spelling of 864847 in words is "eight hundred sixty-four thousand, eight hundred forty-seven".