845638 has 8 divisors (see below), whose sum is σ = 1298088. Its totient is φ = 412944.

The previous prime is 845623. The next prime is 845653. The reversal of 845638 is 836548.

It is an interprime number because it is at equal distance from previous prime (845623) and next prime (845653).

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

It is a congruent number.

It is an unprimeable number.

845638 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4831 + ... + 5002.

It is an arithmetic number, because the mean of its divisors is an integer number (162261).

2⁸⁴⁵⁶³⁸ is an apocalyptic number.

845638 is a deficient number, since it is larger than the sum of its proper divisors (452450).

845638 is a wasteful number, since it uses less digits than its factorization.

845638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9878.

The product of its digits is 23040, while the sum is 34.

The square root of 845638 is about 919.5857763145. The cubic root of 845638 is about 94.5645071541.

The spelling of 845638 in words is "eight hundred forty-five thousand, six hundred thirty-eight".