421718420 has 48 divisors (see below), whose sum is σ = 919876608. Its totient is φ = 162228480.

The previous prime is 421718419. The next prime is 421718431. The reversal of 421718420 is 24817124.

It is a congruent number.

It is an unprimeable 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 in 15 ways as a sum of consecutive naturals, for example, 101504 + ... + 105576.

It is an arithmetic number, because the mean of its divisors is an integer number (19164096).

Almost surely, 2^421718420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421718420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (459938304).

421718420 is an abundant number, since it is smaller than the sum of its proper divisors (498158188).

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

421718420 is a wasteful number, since it uses less digits than its factorization.

421718420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4280 (or 4278 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 421718420 is about 20535.7838905653. The cubic root of 421718420 is about 749.9072003700.

The spelling of 421718420 in words is "four hundred twenty-one million, seven hundred eighteen thousand, four hundred twenty".