421863 has 16 divisors (see below), whose sum is σ = 628320. Its totient is φ = 249984.

The previous prime is 421847. The next prime is 421891. The reversal of 421863 is 368124.

It is a happy number.

It is not a de Polignac number, because 421863 - 2⁴ = 421847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 945 + ... + 1317.

It is an arithmetic number, because the mean of its divisors is an integer number (39270).

2⁴²¹⁸⁶³ is an apocalyptic number.

421863 is a deficient number, since it is larger than the sum of its proper divisors (206457).

421863 is a wasteful number, since it uses less digits than its factorization.

421863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418.

The product of its digits is 1152, while the sum is 24.

The square root of 421863 is about 649.5098151683. The cubic root of 421863 is about 74.9992888821. Note that the first 3 decimals are identical.

Adding to 421863 its reverse (368124), we get a palindrome (789987).

The spelling of 421863 in words is "four hundred twenty-one thousand, eight hundred sixty-three".