421785 has 48 divisors (see below), whose sum is σ = 908544. Its totient is φ = 176256.

The previous prime is 421783. The next prime is 421801. The reversal of 421785 is 587124.

421785 is nontrivially palindromic in base 4.

It is not a de Polignac number, because 421785 - 2¹ = 421783 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 421785.

It is not an unprimeable number, because it can be changed into a prime (421783) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4044 + ... + 4146.

It is an arithmetic number, because the mean of its divisors is an integer number (18928).

2⁴²¹⁷⁸⁵ is an apocalyptic number.

421785 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

421785 is an abundant number, since it is smaller than the sum of its proper divisors (486759).

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

421785 is a wasteful number, since it uses less digits than its factorization.

421785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 131 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 421785 is about 649.4497671106. The cubic root of 421785 is about 74.9946662874.

The spelling of 421785 in words is "four hundred twenty-one thousand, seven hundred eighty-five".