423402440440 has 128 divisors (see below), whose sum is σ = 1124222976000. Its totient is φ = 140439651840.

The previous prime is 423402440369. The next prime is 423402440443. The reversal of 423402440440 is 44044204324.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423402440443) 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, 39202161 + ... + 39212959.

It is an arithmetic number, because the mean of its divisors is an integer number (8782992000).

Almost surely, 2^423402440440 is an apocalyptic number.

423402440440 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 423402440440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (562111488000).

423402440440 is an abundant number, since it is smaller than the sum of its proper divisors (700820535560).

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

423402440440 is a wasteful number, since it uses less digits than its factorization.

423402440440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15365 (or 15361 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 31.

Adding to 423402440440 its reverse (44044204324), we get a palindrome (467446644764).

The spelling of 423402440440 in words is "four hundred twenty-three billion, four hundred two million, four hundred forty thousand, four hundred forty".