421878 has 8 divisors (see below), whose sum is σ = 843768. Its totient is φ = 140624.

The previous prime is 421847. The next prime is 421891. The reversal of 421878 is 878124.

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

421878 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35151 + ... + 35162.

It is an arithmetic number, because the mean of its divisors is an integer number (105471).

2⁴²¹⁸⁷⁸ is an apocalyptic number.

421878 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.

421878 is a wasteful number, since it uses less digits than its factorization.

421878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70318.

The product of its digits is 3584, while the sum is 30.

The square root of 421878 is about 649.5213622353. The cubic root of 421878 is about 75.0001777774. Note that the first 3 decimals are identical.

It can be divided in two parts, 42187 and 8, that added together give a triangular number (42195 = T₂₉₀).

The spelling of 421878 in words is "four hundred twenty-one thousand, eight hundred seventy-eight".