403421 has 4 divisors (see below), whose sum is σ = 404700. Its totient is φ = 402144.

The previous prime is 403391. The next prime is 403433. The reversal of 403421 is 124304.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 60025 + 343396 = 245^2 + 586^2 .

It is a cyclic number.

It is not a de Polignac number, because 403421 - 2¹⁸ = 141277 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 403396 and 403405.

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 403421.

It is not an unprimeable number, because it can be changed into a prime (403621) 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, 215 + ... + 923.

It is an arithmetic number, because the mean of its divisors is an integer number (101175).

2⁴⁰³⁴²¹ is an apocalyptic number.

It is an amenable number.

403421 is a deficient number, since it is larger than the sum of its proper divisors (1279).

403421 is an equidigital number, since it uses as much as digits as its factorization.

403421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 403421 is about 635.1543119589. The cubic root of 403421 is about 73.8900851769.

Adding to 403421 its reverse (124304), we get a palindrome (527725).

The spelling of 403421 in words is "four hundred three thousand, four hundred twenty-one", and thus it is an iban number.