865449 has 18 divisors (see below), whose sum is σ = 1356030. Its totient is φ = 531648.

The previous prime is 865409. The next prime is 865457. The reversal of 865449 is 944568.

865449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 28224 + 837225 = 168^2 + 915^2 .

It is not a de Polignac number, because 865449 - 2⁷ = 865321 is a prime.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (865409) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1237 + ... + 1805.

It is an arithmetic number, because the mean of its divisors is an integer number (75335).

2⁸⁶⁵⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

865449 is a deficient number, since it is larger than the sum of its proper divisors (490581).

865449 is a wasteful number, since it uses less digits than its factorization.

865449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601 (or 585 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 865449 is about 930.2951144664. The cubic root of 865449 is about 95.2972774578.

Adding to 865449 its product of digits (34560), we get a palindrome (900009).

The spelling of 865449 in words is "eight hundred sixty-five thousand, four hundred forty-nine".