421578 has 32 divisors (see below), whose sum is σ = 966720. Its totient is φ = 136080.

The previous prime is 421559. The next prime is 421607. The reversal of 421578 is 875124.

421578 is nontrivially palindromic in base 7.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

421578 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 15 ways as a sum of consecutive naturals, for example, 1893 + ... + 2103.

It is an arithmetic number, because the mean of its divisors is an integer number (30210).

2⁴²¹⁵⁷⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (483360).

421578 is an abundant number, since it is smaller than the sum of its proper divisors (545142).

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

421578 is a wasteful number, since it uses less digits than its factorization.

421578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259 (or 253 counting only the distinct ones).

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

The square root of 421578 is about 649.2903818786. The cubic root of 421578 is about 74.9823958683.

It can be divided in two parts, 421 and 578, that added together give a palindrome (999).

The spelling of 421578 in words is "four hundred twenty-one thousand, five hundred seventy-eight".