421403 has 4 divisors (see below), whose sum is σ = 429408. Its totient is φ = 413400.

The previous prime is 421397. The next prime is 421409. The reversal of 421403 is 304124.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (421397) and next prime (421409).

It is not a de Polignac number, because 421403 - 2⁶ = 421339 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 421403.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3923 + ... + 4028.

It is an arithmetic number, because the mean of its divisors is an integer number (107352).

2⁴²¹⁴⁰³ is an apocalyptic number.

421403 is a deficient number, since it is larger than the sum of its proper divisors (8005).

421403 is an equidigital number, since it uses as much as digits as its factorization.

421403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8004.

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

The square root of 421403 is about 649.1556053829. The cubic root of 421403 is about 74.9720191919.

Adding to 421403 its reverse (304124), we get a palindrome (725527).

The spelling of 421403 in words is "four hundred twenty-one thousand, four hundred three", and thus it is an iban number.