845420 has 24 divisors (see below), whose sum is σ = 1820448. Its totient is φ = 329600.

The previous prime is 845387. The next prime is 845431. The reversal of 845420 is 24548.

It is an unprimeable 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 7 ways as a sum of consecutive naturals, for example, 305 + ... + 1335.

It is an arithmetic number, because the mean of its divisors is an integer number (75852).

2⁸⁴⁵⁴²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 845420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (910224).

845420 is an abundant number, since it is smaller than the sum of its proper divisors (975028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

845420 is a wasteful number, since it uses less digits than its factorization.

845420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081 (or 1079 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 845420 is about 919.4672370455. The cubic root of 845420 is about 94.5563804166.

Adding to 845420 its reverse (24548), we get a palindrome (869968).

The spelling of 845420 in words is "eight hundred forty-five thousand, four hundred twenty".