421860 has 48 divisors (see below), whose sum is σ = 1209600. Its totient is φ = 109824.

The previous prime is 421847. The next prime is 421891. The reversal of 421860 is 68124.

It is an unprimeable number.

421860 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4696 + ... + 4784.

It is an arithmetic number, because the mean of its divisors is an integer number (25200).

2⁴²¹⁸⁶⁰ 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 421860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (604800).

421860 is an abundant number, since it is smaller than the sum of its proper divisors (787740).

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

421860 is a wasteful number, since it uses less digits than its factorization.

421860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 421860 is about 649.5075057303. The cubic root of 421860 is about 74.9991111006. Note that the first 3 decimals are identical.

Adding to 421860 its reverse (68124), we get a palindrome (489984).

It can be divided in two parts, 4218 and 60, that added together give a triangular number (4278 = T₉₂).

The spelling of 421860 in words is "four hundred twenty-one thousand, eight hundred sixty".