865398 has 16 divisors (see below), whose sum is σ = 1806336. Its totient is φ = 275880.

The previous prime is 865379. The next prime is 865409. The reversal of 865398 is 893568.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 865398.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2998 + ... + 3273.

It is an arithmetic number, because the mean of its divisors is an integer number (112896).

2⁸⁶⁵³⁹⁸ is an apocalyptic number.

865398 is an abundant number, since it is smaller than the sum of its proper divisors (940938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

865398 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 12 representation: 865398 = (358986)₁₂.

865398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6299.

The product of its digits is 51840, while the sum is 39.

The square root of 865398 is about 930.2677034059. The cubic root of 865398 is about 95.2954054983.

The spelling of 865398 in words is "eight hundred sixty-five thousand, three hundred ninety-eight".