421445304 has 96 divisors (see below), whose sum is σ = 1307329920. Its totient is φ = 120149568.

The previous prime is 421445267. The next prime is 421445357. The reversal of 421445304 is 403544124.

It is a happy number.

It is a super-2 number, since 2×421445304² = 355232288527304832, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 444559 + ... + 445505.

It is an arithmetic number, because the mean of its divisors is an integer number (13618020).

Almost surely, 2^421445304 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 421445304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (653664960).

421445304 is an abundant number, since it is smaller than the sum of its proper divisors (885884616).

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

421445304 is a wasteful number, since it uses less digits than its factorization.

421445304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849 (or 1842 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 421445304 is about 20529.1330552461. The cubic root of 421445304 is about 749.7452788326.

Adding to 421445304 its reverse (403544124), we get a palindrome (824989428).

The spelling of 421445304 in words is "four hundred twenty-one million, four hundred forty-five thousand, three hundred four".