421804218 has 64 divisors (see below), whose sum is σ = 995028480. Its totient is φ = 117806400.

The previous prime is 421804213. The next prime is 421804241. The reversal of 421804218 is 812408124.

It is not an unprimeable number, because it can be changed into a prime (421804213) 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 31 ways as a sum of consecutive naturals, for example, 41853 + ... + 50943.

It is an arithmetic number, because the mean of its divisors is an integer number (15547320).

Almost surely, 2^421804218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421804218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (497514240).

421804218 is an abundant number, since it is smaller than the sum of its proper divisors (573224262).

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

421804218 is a wasteful number, since it uses less digits than its factorization.

421804218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9163.

The product of its (nonzero) digits is 4096, while the sum is 30.

The square root of 421804218 is about 20537.8727720278. The cubic root of 421804218 is about 749.9580527651.

It can be divided in two parts, 4218042 and 18, that added together give a triangular number (4218060 = T₂₉₀₄).

The spelling of 421804218 in words is "four hundred twenty-one million, eight hundred four thousand, two hundred eighteen".