421230440 has 64 divisors (see below), whose sum is σ = 967271760. Its totient is φ = 165058560.

The previous prime is 421230427. The next prime is 421230443. The reversal of 421230440 is 44032124.

It can be written as a sum of positive squares in 8 ways, for example, as 64096036 + 357134404 = 8006^2 + 18898^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (421230443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 528122 + ... + 528918.

Almost surely, 2^421230440 is an apocalyptic number.

421230440 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 421230440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (483635880).

421230440 is an abundant number, since it is smaller than the sum of its proper divisors (546041320).

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

421230440 is a wasteful number, since it uses less digits than its factorization.

421230440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062 (or 1058 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 421230440 is about 20523.8992396669. The cubic root of 421230440 is about 749.6178438271.

Adding to 421230440 its reverse (44032124), we get a palindrome (465262564).

The spelling of 421230440 in words is "four hundred twenty-one million, two hundred thirty thousand, four hundred forty".