404421 has 4 divisors (see below), whose sum is σ = 539232. Its totient is φ = 269612.

The previous prime is 404419. The next prime is 404423. The reversal of 404421 is 124404.

404421 is nontrivially palindromic in base 7.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (404419) and next prime (404423).

It is a cyclic number.

It is not a de Polignac number, because 404421 - 2¹ = 404419 is a prime.

It is a D-number.

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 404421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67401 + ... + 67406.

It is an arithmetic number, because the mean of its divisors is an integer number (134808).

2⁴⁰⁴⁴²¹ is an apocalyptic number.

It is an amenable number.

404421 is a deficient number, since it is larger than the sum of its proper divisors (134811).

404421 is a wasteful number, since it uses less digits than its factorization.

404421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134810.

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

The square root of 404421 is about 635.9410350025. The cubic root of 404421 is about 73.9510877162.

Adding to 404421 its reverse (124404), we get a palindrome (528825).

The spelling of 404421 in words is "four hundred four thousand, four hundred twenty-one", and thus it is an iban number.