845641 has 4 divisors (see below), whose sum is σ = 882432. Its totient is φ = 808852.

The previous prime is 845623. The next prime is 845653. The reversal of 845641 is 146548.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 845641 - 2⁹ = 845129 is a prime.

It is a Duffinian number.

845641 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (845041) by changing a digit.

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, 18361 + ... + 18406.

It is an arithmetic number, because the mean of its divisors is an integer number (220608).

2⁸⁴⁵⁶⁴¹ is an apocalyptic number.

It is an amenable number.

845641 is a deficient number, since it is larger than the sum of its proper divisors (36791).

845641 is a wasteful number, since it uses less digits than its factorization.

845641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36790.

The product of its digits is 3840, while the sum is 28.

The square root of 845641 is about 919.5874074823. The cubic root of 845641 is about 94.5646189802.

The spelling of 845641 in words is "eight hundred forty-five thousand, six hundred forty-one".