423040520 has 96 divisors (see below), whose sum is σ = 1118729880. Its totient is φ = 143539200.

The previous prime is 423040517. The next prime is 423040531. The reversal of 423040520 is 25040324.

It can be written as a sum of positive squares in 4 ways, for example, as 340993156 + 82047364 = 18466^2 + 9058^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 423040492 and 423040501.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 196892 + ... + 199028.

Almost surely, 2^423040520 is an apocalyptic number.

423040520 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 423040520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (559364940).

423040520 is an abundant number, since it is smaller than the sum of its proper divisors (695689360).

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

423040520 is a wasteful number, since it uses less digits than its factorization.

423040520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263 (or 2252 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 423040520 is about 20567.9488525229. The cubic root of 423040520 is about 750.6900434439.

Adding to 423040520 its reverse (25040324), we get a palindrome (448080844).

The spelling of 423040520 in words is "four hundred twenty-three million, forty thousand, five hundred twenty".