845645 has 4 divisors (see below), whose sum is σ = 1014780. Its totient is φ = 676512.

The previous prime is 845623. The next prime is 845653. The reversal of 845645 is 546548.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 158404 + 687241 = 398^2 + 829^2 .

It is a cyclic number.

It is not a de Polignac number, because 845645 - 2¹⁰ = 844621 is a prime.

It is a super-3 number, since 3×845645³ = 1814201454800133375, which contains 333 as substring.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84560 + ... + 84569.

It is an arithmetic number, because the mean of its divisors is an integer number (253695).

2⁸⁴⁵⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

845645 is a deficient number, since it is larger than the sum of its proper divisors (169135).

845645 is a wasteful number, since it uses less digits than its factorization.

845645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169134.

The product of its digits is 19200, while the sum is 32.

The square root of 845645 is about 919.5895823681. The cubic root of 845645 is about 94.5647680813.

The spelling of 845645 in words is "eight hundred forty-five thousand, six hundred forty-five".