845643 has 8 divisors (see below), whose sum is σ = 1146256. Its totient is φ = 554400.

The previous prime is 845623. The next prime is 845653. The reversal of 845643 is 346548.

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

It is not a de Polignac number, because 845643 - 2⁸ = 845387 is a prime.

It is a super-2 number, since 2×845643² = 1430224166898, which contains 22 as substring.

It is an Ulam number.

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 845643.

It is not an unprimeable number, because it can be changed into a prime (845623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2128 + ... + 2493.

It is an arithmetic number, because the mean of its divisors is an integer number (143282).

2⁸⁴⁵⁶⁴³ is an apocalyptic number.

845643 is a deficient number, since it is larger than the sum of its proper divisors (300613).

845643 is a wasteful number, since it uses less digits than its factorization.

845643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4685.

The product of its digits is 11520, while the sum is 30.

The square root of 845643 is about 919.5884949259. The cubic root of 845643 is about 94.5646935308.

The spelling of 845643 in words is "eight hundred forty-five thousand, six hundred forty-three".