423312440 has 64 divisors (see below), whose sum is σ = 987068160. Its totient is φ = 163215360.

The previous prime is 423312397. The next prime is 423312451. The reversal of 423312440 is 44213324.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 417374 + ... + 418386.

It is an arithmetic number, because the mean of its divisors is an integer number (15422940).

Almost surely, 2^423312440 is an apocalyptic number.

423312440 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 423312440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (493534080).

423312440 is an abundant number, since it is smaller than the sum of its proper divisors (563755720).

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

423312440 is a wasteful number, since it uses less digits than its factorization.

423312440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392 (or 1388 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 423312440 is about 20574.5580754484. The cubic root of 423312440 is about 750.8508506688.

Adding to 423312440 its reverse (44213324), we get a palindrome (467525764).

The spelling of 423312440 in words is "four hundred twenty-three million, three hundred twelve thousand, four hundred forty".