421854 has 8 divisors (see below), whose sum is σ = 843720. Its totient is φ = 140616.

The previous prime is 421847. The next prime is 421891. The reversal of 421854 is 458124.

It is a sphenic number, since it is the product of 3 distinct primes.

421854 is an admirable number.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

421854 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35149 + ... + 35160.

It is an arithmetic number, because the mean of its divisors is an integer number (105465).

2⁴²¹⁸⁵⁴ is an apocalyptic number.

421854 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421854 is a wasteful number, since it uses less digits than its factorization.

421854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70314.

The product of its digits is 1280, while the sum is 24.

The square root of 421854 is about 649.5028868296. The cubic root of 421854 is about 74.9987555349.

Adding to 421854 its reverse (458124), we get a palindrome (879978).

It can be divided in two parts, 421 and 854, that added together give a triangular number (1275 = T₅₀).

The spelling of 421854 in words is "four hundred twenty-one thousand, eight hundred fifty-four".