421812 has 18 divisors (see below), whose sum is σ = 1066338. Its totient is φ = 140592.

The previous prime is 421807. The next prime is 421831. The reversal of 421812 is 218124.

421812 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 224676 + 197136 = 474^2 + 444^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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 421812.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5823 + ... + 5894.

It is an arithmetic number, because the mean of its divisors is an integer number (59241).

2⁴²¹⁸¹² is an apocalyptic number.

It is an amenable number.

421812 is an abundant number, since it is smaller than the sum of its proper divisors (644526).

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

421812 is a wasteful number, since it uses less digits than its factorization.

421812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11727 (or 11722 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

The square root of 421812 is about 649.4705536050. The cubic root of 421812 is about 74.9962664808.

Adding to 421812 its reverse (218124), we get a palindrome (639936).

The spelling of 421812 in words is "four hundred twenty-one thousand, eight hundred twelve".