421760 has 32 divisors (see below), whose sum is σ = 1009800. Its totient is φ = 168448.

The previous prime is 421741. The next prime is 421783. The reversal of 421760 is 67124.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311 + ... + 969.

2⁴²¹⁷⁶⁰ is an apocalyptic number.

421760 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 421760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (504900).

421760 is an abundant number, since it is smaller than the sum of its proper divisors (588040).

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

421760 is an equidigital number, since it uses as much as digits as its factorization.

421760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678 (or 666 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 421760 is about 649.4305197633. The cubic root of 421760 is about 74.9931845659.

Adding to 421760 its reverse (67124), we get a palindrome (488884).

It can be divided in two parts, 42 and 1760, that multiplied together give a triangular number (73920 = T₃₈₄).

The spelling of 421760 in words is "four hundred twenty-one thousand, seven hundred sixty".