845423 has 4 divisors (see below), whose sum is σ = 865128. Its totient is φ = 825720.

The previous prime is 845387. The next prime is 845431. The reversal of 845423 is 324548.

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

It is a cyclic number.

It is not a de Polignac number, because 845423 - 2⁸ = 845167 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 845392 and 845401.

It is a congruent number.

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

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 3 ways as a sum of consecutive naturals, for example, 9788 + ... + 9873.

It is an arithmetic number, because the mean of its divisors is an integer number (216282).

2⁸⁴⁵⁴²³ is an apocalyptic number.

845423 is a deficient number, since it is larger than the sum of its proper divisors (19705).

845423 is a wasteful number, since it uses less digits than its factorization.

845423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19704.

The product of its digits is 3840, while the sum is 26.

The square root of 845423 is about 919.4688684235. The cubic root of 845423 is about 94.5564922619.

It can be divided in two parts, 845 and 423, that multiplied together give a triangular number (357435 = T₈₄₅).

The spelling of 845423 in words is "eight hundred forty-five thousand, four hundred twenty-three".