423509988 has 48 divisors (see below), whose sum is σ = 1087603776. Its totient is φ = 127196160.

The previous prime is 423509987. The next prime is 423510013. The reversal of 423509988 is 889905324.

It is not an unprimeable number, because it can be changed into a prime (423509987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 720 + ... + 29112.

It is an arithmetic number, because the mean of its divisors is an integer number (22658412).

Almost surely, 2^423509988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 423509988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (543801888).

423509988 is an abundant number, since it is smaller than the sum of its proper divisors (664093788).

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

423509988 is a wasteful number, since it uses less digits than its factorization.

423509988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28524 (or 28522 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 48.

The square root of 423509988 is about 20579.3582990335. The cubic root of 423509988 is about 750.9676328232.

The spelling of 423509988 in words is "four hundred twenty-three million, five hundred nine thousand, nine hundred eighty-eight".