421244340 has 96 divisors (see below), whose sum is σ = 1316722176. Its totient is φ = 99738240.

The previous prime is 421244311. The next prime is 421244347. The reversal of 421244340 is 43442124.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 421244340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421244347) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20959 + ... + 35801.

It is an arithmetic number, because the mean of its divisors is an integer number (13715856).

Almost surely, 2^421244340 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 421244340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (658361088).

421244340 is an abundant number, since it is smaller than the sum of its proper divisors (895477836).

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

421244340 is a wasteful number, since it uses less digits than its factorization.

421244340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14909 (or 14907 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 421244340 is about 20524.2378664836. The cubic root of 421244340 is about 749.6260891741.

Adding to 421244340 its reverse (43442124), we get a palindrome (464686464).

It can be divided in two parts, 42124 and 4340, that added together give a palindrome (46464).

The spelling of 421244340 in words is "four hundred twenty-one million, two hundred forty-four thousand, three hundred forty".