421104640 has 88 divisors (see below), whose sum is σ = 1102137552. Its totient is φ = 153108480.

The previous prime is 421104623. The next prime is 421104647. The reversal of 421104640 is 46401124.

It is a tau number, because it is divible by the number of its divisors (88).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (421104647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52582 + ... + 60058.

Almost surely, 2^421104640 is an apocalyptic number.

421104640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421104640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (551068776).

421104640 is an abundant number, since it is smaller than the sum of its proper divisors (681032912).

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

421104640 is a wasteful number, since it uses less digits than its factorization.

421104640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7513 (or 7495 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 421104640 is about 20520.8342910321. The cubic root of 421104640 is about 749.5432122201.

Adding to 421104640 its reverse (46401124), we get a palindrome (467505764).

The spelling of 421104640 in words is "four hundred twenty-one million, one hundred four thousand, six hundred forty".