423021330 has 96 divisors (see below), whose sum is σ = 1121318640. Its totient is φ = 110630400.

The previous prime is 423021329. The next prime is 423021371. The reversal of 423021330 is 33120324.

423021330 is a `hidden beast` number, since 423 + 0 + 213 + 30 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 293539689 + 129481641 = 17133^2 + 11379^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1572436 + ... + 1572704.

Almost surely, 2^423021330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 423021330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (560659320).

423021330 is an abundant number, since it is smaller than the sum of its proper divisors (698297310).

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

423021330 is a wasteful number, since it uses less digits than its factorization.

423021330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556 (or 553 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 423021330 is about 20567.4823447110. The cubic root of 423021330 is about 750.6786923171.

Adding to 423021330 its reverse (33120324), we get a palindrome (456141654).

The spelling of 423021330 in words is "four hundred twenty-three million, twenty-one thousand, three hundred thirty".