423623440 has 40 divisors (see below), whose sum is σ = 993661848. Its totient is φ = 167946240.

The previous prime is 423623429. The next prime is 423623443. The reversal of 423623440 is 44326324.

It can be written as a sum of positive squares in 4 ways, for example, as 1567504 + 422055936 = 1252^2 + 20544^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 423623399 and 423623408.

It is not an unprimeable number, because it can be changed into a prime (423623443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14391 + ... + 32470.

Almost surely, 2^423623440 is an apocalyptic number.

423623440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

423623440 is an abundant number, since it is smaller than the sum of its proper divisors (570038408).

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

423623440 is a wasteful number, since it uses less digits than its factorization.

423623440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46987 (or 46981 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 28.

The square root of 423623440 is about 20582.1145658069. The cubic root of 423623440 is about 751.0346845068.

Adding to 423623440 its reverse (44326324), we get a palindrome (467949764).

The spelling of 423623440 in words is "four hundred twenty-three million, six hundred twenty-three thousand, four hundred forty".