421404 has 12 divisors (see below), whose sum is σ = 983304. Its totient is φ = 140464.

The previous prime is 421397. The next prime is 421409. The reversal of 421404 is 404124.

421404 = 226² + 227² + ... + 233².

It is a tau number, because it is divible by the number of its divisors (12).

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 421404.

It is not an unprimeable number, because it can be changed into a prime (421409) by changing a digit.

421404 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 3 ways as a sum of consecutive naturals, for example, 17547 + ... + 17570.

It is an arithmetic number, because the mean of its divisors is an integer number (81942).

2⁴²¹⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

421404 is an abundant number, since it is smaller than the sum of its proper divisors (561900).

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

421404 is a wasteful number, since it uses less digits than its factorization.

421404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35124 (or 35122 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 421404 is about 649.1563756138. The cubic root of 421404 is about 74.9720784954.

Adding to 421404 its reverse (404124), we get a palindrome (825528).

The spelling of 421404 in words is "four hundred twenty-one thousand, four hundred four", and thus it is an iban number.