864447 has 8 divisors (see below), whose sum is σ = 1159344. Its totient is φ = 572928.

The previous prime is 864439. The next prime is 864449. The reversal of 864447 is 744468.

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

It is not a de Polignac number, because 864447 - 2³ = 864439 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168 + ... + 1325.

It is an arithmetic number, because the mean of its divisors is an integer number (144918).

2⁸⁶⁴⁴⁴⁷ is an apocalyptic number.

864447 is a deficient number, since it is larger than the sum of its proper divisors (294897).

864447 is a wasteful number, since it uses less digits than its factorization.

864447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689.

The product of its digits is 21504, while the sum is 33.

The square root of 864447 is about 929.7564197143. The cubic root of 864447 is about 95.2604854778.

The spelling of 864447 in words is "eight hundred sixty-four thousand, four hundred forty-seven".