421013440 has 56 divisors (see below), whose sum is σ = 1006297200. Its totient is φ = 167774208.

The previous prime is 421013429. The next prime is 421013441. The reversal of 421013440 is 44310124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421013441) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 88236 + ... + 92884.

Almost surely, 2^421013440 is an apocalyptic number.

421013440 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 421013440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (503148600).

421013440 is an abundant number, since it is smaller than the sum of its proper divisors (585283760).

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

421013440 is a wasteful number, since it uses less digits than its factorization.

421013440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4949 (or 4939 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 421013440 is about 20518.6120388295. The cubic root of 421013440 is about 749.4890979771.

Adding to 421013440 its reverse (44310124), we get a palindrome (465323564).

The spelling of 421013440 in words is "four hundred twenty-one million, thirteen thousand, four hundred forty".