421560 has 48 divisors (see below), whose sum is σ = 1371240. Its totient is φ = 112320.

The previous prime is 421559. The next prime is 421607. The reversal of 421560 is 65124.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 421560.

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 11 ways as a sum of consecutive naturals, for example, 226 + ... + 945.

2⁴²¹⁵⁶⁰ is an apocalyptic number.

421560 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (685620).

421560 is an abundant number, since it is smaller than the sum of its proper divisors (949680).

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

421560 is a wasteful number, since it uses less digits than its factorization.

421560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188 (or 1181 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 421560 is about 649.2765204441. The cubic root of 421560 is about 74.9813286855.

Adding to 421560 its reverse (65124), we get a palindrome (486684).

The spelling of 421560 in words is "four hundred twenty-one thousand, five hundred sixty".