421868 has 6 divisors (see below), whose sum is σ = 738276. Its totient is φ = 210932.

The previous prime is 421847. The next prime is 421891. The reversal of 421868 is 868124.

It is a self number, because there is not a number n which added to its sum of digits gives 421868.

It is an unprimeable number.

421868 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 52730 + ... + 52737.

It is an arithmetic number, because the mean of its divisors is an integer number (123046).

2⁴²¹⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

421868 is a deficient number, since it is larger than the sum of its proper divisors (316408).

421868 is a wasteful number, since it uses less digits than its factorization.

421868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105471 (or 105469 counting only the distinct ones).

The product of its digits is 3072, while the sum is 29.

The square root of 421868 is about 649.5136642135. The cubic root of 421868 is about 74.9995851829. Note that the first 3 decimals are identical.

The spelling of 421868 in words is "four hundred twenty-one thousand, eight hundred sixty-eight".