859638 has 32 divisors (see below), whose sum is σ = 1886976. Its totient is φ = 259488.

The previous prime is 859633. The next prime is 859657. The reversal of 859638 is 836958.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 859596 and 859605.

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 859638.

It is not an unprimeable number, because it can be changed into a prime (859633) by changing a digit.

859638 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7981 + ... + 8087.

It is an arithmetic number, because the mean of its divisors is an integer number (58968).

2⁸⁵⁹⁶³⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 859638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (943488).

859638 is an abundant number, since it is smaller than the sum of its proper divisors (1027338).

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

859638 is a wasteful number, since it uses less digits than its factorization.

859638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228.

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

The square root of 859638 is about 927.1666516867. The cubic root of 859638 is about 95.0835092110.

The spelling of 859638 in words is "eight hundred fifty-nine thousand, six hundred thirty-eight".