421331904 has 168 divisors, whose sum is σ = 1397934720. Its totient is φ = 118835712.

The previous prime is 421331873. The next prime is 421331929. The reversal of 421331904 is 409133124.

It is a tau number, because it is divible by the number of its divisors (168).

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 23 ways as a sum of consecutive naturals, for example, 334027 + ... + 335285.

It is an arithmetic number, because the mean of its divisors is an integer number (8321040).

Almost surely, 2^421331904 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 421331904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (698967360).

421331904 is an abundant number, since it is smaller than the sum of its proper divisors (976602816).

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

421331904 is a wasteful number, since it uses less digits than its factorization.

421331904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1367 (or 1354 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 421331904 is about 20526.3709408166. The cubic root of 421331904 is about 749.6780271311.

The spelling of 421331904 in words is "four hundred twenty-one million, three hundred thirty-one thousand, nine hundred four".