423431440 has 40 divisors (see below), whose sum is σ = 986544000. Its totient is φ = 169017216.

The previous prime is 423431381. The next prime is 423431447. The reversal of 423431440 is 44134324.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (423431447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34617 + ... + 45223.

It is an arithmetic number, because the mean of its divisors is an integer number (24663600).

Almost surely, 2^423431440 is an apocalyptic number.

423431440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

423431440 is an abundant number, since it is smaller than the sum of its proper divisors (563112560).

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

423431440 is a wasteful number, since it uses less digits than its factorization.

423431440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11119 (or 11113 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 423431440 is about 20577.4497934025. The cubic root of 423431440 is about 750.9212028653.

Adding to 423431440 its reverse (44134324), we get a palindrome (467565764).

The spelling of 423431440 in words is "four hundred twenty-three million, four hundred thirty-one thousand, four hundred forty".