421884 has 18 divisors (see below), whose sum is σ = 1066520. Its totient is φ = 140616.

The previous prime is 421847. The next prime is 421891. The reversal of 421884 is 488124.

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

It is a super-2 number, since 2×421884² = 355972218912, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

421884 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 5 ways as a sum of consecutive naturals, for example, 5824 + ... + 5895.

2⁴²¹⁸⁸⁴ is an apocalyptic number.

It is an amenable number.

421884 is an abundant number, since it is smaller than the sum of its proper divisors (644636).

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

421884 is a wasteful number, since it uses less digits than its factorization.

421884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11729 (or 11724 counting only the distinct ones).

The product of its digits is 2048, while the sum is 27.

The square root of 421884 is about 649.5259810046. The cubic root of 421884 is about 75.0005333295. Note that the first 3 decimals are identical.

The spelling of 421884 in words is "four hundred twenty-one thousand, eight hundred eighty-four".