421855860 has 96 divisors (see below), whose sum is σ = 1251815040. Its totient is φ = 105850368.

The previous prime is 421855853. The next prime is 421855873. The reversal of 421855860 is 68558124.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 177802 + ... + 180158.

It is an arithmetic number, because the mean of its divisors is an integer number (13039740).

Almost surely, 2^421855860 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 421855860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (625907520).

421855860 is an abundant number, since it is smaller than the sum of its proper divisors (829959180).

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

421855860 is a wasteful number, since it uses less digits than its factorization.

421855860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2545 (or 2543 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 39.

The square root of 421855860 is about 20539.1299718367. The cubic root of 421855860 is about 749.9886576062.

The spelling of 421855860 in words is "four hundred twenty-one million, eight hundred fifty-five thousand, eight hundred sixty".