423031520 has 24 divisors (see below), whose sum is σ = 999412344. Its totient is φ = 169212544.

The previous prime is 423031457. The next prime is 423031547. The reversal of 423031520 is 25130324.

It is a happy number.

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 = 423031492 and 423031501.

It is a congruent number.

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, 1321814 + ... + 1322133.

It is an arithmetic number, because the mean of its divisors is an integer number (41642181).

Almost surely, 2^423031520 is an apocalyptic number.

423031520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

423031520 is an abundant number, since it is smaller than the sum of its proper divisors (576380824).

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

423031520 is a wasteful number, since it uses less digits than its factorization.

423031520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2643962 (or 2643954 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 423031520 is about 20567.7300643508. The cubic root of 423031520 is about 750.6847198732.

Adding to 423031520 its reverse (25130324), we get a palindrome (448161844).

The spelling of 423031520 in words is "four hundred twenty-three million, thirty-one thousand, five hundred twenty".