421803 has 6 divisors (see below), whose sum is σ = 609284. Its totient is φ = 281196.

The previous prime is 421801. The next prime is 421807. The reversal of 421803 is 308124.

It is a happy number.

It is not a de Polignac number, because 421803 - 2¹ = 421801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23425 + ... + 23442.

2⁴²¹⁸⁰³ is an apocalyptic number.

421803 is a deficient number, since it is larger than the sum of its proper divisors (187481).

421803 is a wasteful number, since it uses less digits than its factorization.

421803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46873 (or 46870 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 421803 is about 649.4636248475. The cubic root of 421803 is about 74.9957330906.

Adding to 421803 its sum of digits (18), we get a triangular number (421821 = T₉₁₈).

Adding to 421803 its reverse (308124), we get a palindrome (729927).

The spelling of 421803 in words is "four hundred twenty-one thousand, eight hundred three".