864489 has 8 divisors (see below), whose sum is σ = 1162240. Its totient is φ = 571536.

The previous prime is 864449. The next prime is 864491. The reversal of 864489 is 984468.

864489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 864489 - 2⁷ = 864361 is a prime.

It is a super-2 number, since 2×864489² = 1494682462242, which contains 22 as substring.

It is a Duffinian number.

864489 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 864489.

It is not an unprimeable number, because it can be changed into a prime (864419) 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, 754 + ... + 1515.

It is an arithmetic number, because the mean of its divisors is an integer number (145280).

2⁸⁶⁴⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

864489 is a deficient number, since it is larger than the sum of its proper divisors (297751).

864489 is a wasteful number, since it uses less digits than its factorization.

864489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2399.

The product of its digits is 55296, while the sum is 39.

The square root of 864489 is about 929.7790060009. The cubic root of 864489 is about 95.2620282273.

The spelling of 864489 in words is "eight hundred sixty-four thousand, four hundred eighty-nine".