865406 has 8 divisors (see below), whose sum is σ = 1311024. Its totient is φ = 428400.

The previous prime is 865379. The next prime is 865409. The reversal of 865406 is 604568.

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

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 865406.

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 3 ways as a sum of consecutive naturals, for example, 1895 + ... + 2306.

It is an arithmetic number, because the mean of its divisors is an integer number (163878).

2⁸⁶⁵⁴⁰⁶ is an apocalyptic number.

865406 is a deficient number, since it is larger than the sum of its proper divisors (445618).

865406 is a wasteful number, since it uses less digits than its factorization.

865406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4306.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 865406 is about 930.2720032335. The cubic root of 865406 is about 95.2956991438.

The spelling of 865406 in words is "eight hundred sixty-five thousand, four hundred six".