423531440 has 20 divisors (see below), whose sum is σ = 984710784. Its totient is φ = 169412544.

The previous prime is 423531439. The next prime is 423531461. The reversal of 423531440 is 44135324.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2646992 + ... + 2647151.

Almost surely, 2^423531440 is an apocalyptic number.

423531440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

423531440 is an abundant number, since it is smaller than the sum of its proper divisors (561179344).

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

423531440 is a wasteful number, since it uses less digits than its factorization.

423531440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5294156 (or 5294150 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 423531440 is about 20579.8794943022. The cubic root of 423531440 is about 750.9803121665.

Adding to 423531440 its reverse (44135324), we get a palindrome (467666764).

The spelling of 423531440 in words is "four hundred twenty-three million, five hundred thirty-one thousand, four hundred forty".