864247 has 4 divisors (see below), whose sum is σ = 876160. Its totient is φ = 852336.

The previous prime is 864223. The next prime is 864251. The reversal of 864247 is 742468.

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 864247 - 2⁷ = 864119 is a prime.

It is a d-powerful number, because it can be written as 8⁵ + 6⁵ + 2⁷ + 4² + 4² + 7⁷ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864277) 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, 5847 + ... + 5992.

It is an arithmetic number, because the mean of its divisors is an integer number (219040).

2⁸⁶⁴²⁴⁷ is an apocalyptic number.

864247 is a deficient number, since it is larger than the sum of its proper divisors (11913).

864247 is a wasteful number, since it uses less digits than its factorization.

864247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11912.

The product of its digits is 10752, while the sum is 31.

The square root of 864247 is about 929.6488584406. The cubic root of 864247 is about 95.2531383658.

It can be divided in two parts, 864 and 247, that added together give a palindrome (1111).

The spelling of 864247 in words is "eight hundred sixty-four thousand, two hundred forty-seven".