421704 has 24 divisors (see below), whose sum is σ = 1142310. Its totient is φ = 140544.

The previous prime is 421703. The next prime is 421709. The reversal of 421704 is 407124.

Added to its reverse (407124) it gives a triangular number (828828 = T₁₂₈₇).

421704 = T₉₇ + T₉₈ + ... + T₁₅₀.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 260100 + 161604 = 510^2 + 402^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (421703) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2857 + ... + 3000.

2⁴²¹⁷⁰⁴ is an apocalyptic number.

It is an amenable number.

421704 is an abundant number, since it is smaller than the sum of its proper divisors (720606).

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

421704 is a wasteful number, since it uses less digits than its factorization.

421704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5869 (or 5862 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 421704 is about 649.3874036351. The cubic root of 421704 is about 74.9898652972.

Adding to 421704 its reverse (407124), we get a palindrome (828828).

The spelling of 421704 in words is "four hundred twenty-one thousand, seven hundred four", and thus it is an iban number.