423403520 has 56 divisors (see below), whose sum is σ = 1016204724. Its totient is φ = 169345024.

The previous prime is 423403517. The next prime is 423403531. The reversal of 423403520 is 25304324.

It can be written as a sum of positive squares in 2 ways, for example, as 371101696 + 52301824 = 19264^2 + 7232^2 .

It is a super-3 number, since 3×423403520³ (a number of 27 digits) contains 333 as substring.

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, 35792 + ... + 46128.

Almost surely, 2^423403520 is an apocalyptic number.

423403520 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 423403520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (508102362).

423403520 is an abundant number, since it is smaller than the sum of its proper divisors (592801204).

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

423403520 is an equidigital number, since it uses as much as digits as its factorization.

423403520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10368 (or 10344 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 23.

The square root of 423403520 is about 20576.7713696780. The cubic root of 423403520 is about 750.9046978865.

Adding to 423403520 its reverse (25304324), we get a palindrome (448707844).

The spelling of 423403520 in words is "four hundred twenty-three million, four hundred three thousand, five hundred twenty".