865397 has 4 divisors (see below), whose sum is σ = 931980. Its totient is φ = 798816.

The previous prime is 865379. The next prime is 865409. The reversal of 865397 is 793568.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75076 + 790321 = 274^2 + 889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-865397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 865397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865307) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 33272 + ... + 33297.

It is an arithmetic number, because the mean of its divisors is an integer number (232995).

2⁸⁶⁵³⁹⁷ is an apocalyptic number.

It is an amenable number.

865397 is a deficient number, since it is larger than the sum of its proper divisors (66583).

865397 is a wasteful number, since it uses less digits than its factorization.

865397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66582.

The product of its digits is 45360, while the sum is 38.

The square root of 865397 is about 930.2671659260. The cubic root of 865397 is about 95.2953687924.

The spelling of 865397 in words is "eight hundred sixty-five thousand, three hundred ninety-seven".