865400 has 24 divisors (see below), whose sum is σ = 2012520. Its totient is φ = 346080.

The previous prime is 865379. The next prime is 865409. The reversal of 865400 is 4568.

865400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 10.

It is a congruent number.

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

865400 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1964 + ... + 2363.

It is an arithmetic number, because the mean of its divisors is an integer number (83855).

2⁸⁶⁵⁴⁰⁰ is an apocalyptic number.

It is an amenable number.

865400 is an abundant number, since it is smaller than the sum of its proper divisors (1147120).

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

865400 is a wasteful number, since it uses less digits than its factorization.

865400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4343 (or 4334 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 865400 is about 930.2687783646. The cubic root of 865400 is about 95.2954789098.

Adding to 865400 its reverse (4568), we get a palindrome (869968).

The spelling of 865400 in words is "eight hundred sixty-five thousand, four hundred".