423221028 has 24 divisors (see below), whose sum is σ = 987870240. Its totient is φ = 141023040.

The previous prime is 423221027. The next prime is 423221033. The reversal of 423221028 is 820122324.

It is a junction number, because it is equal to n+sod(n) for n = 423220989 and 423221007.

It is not an unprimeable number, because it can be changed into a prime (423221027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45408 + ... + 53928.

It is an arithmetic number, because the mean of its divisors is an integer number (41161260).

Almost surely, 2^423221028 is an apocalyptic number.

It is an amenable number.

423221028 is an abundant number, since it is smaller than the sum of its proper divisors (564649212).

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

423221028 is a wasteful number, since it uses less digits than its factorization.

423221028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12667 (or 12665 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 423221028 is about 20572.3364740129. The cubic root of 423221028 is about 750.7967994034.

The spelling of 423221028 in words is "four hundred twenty-three million, two hundred twenty-one thousand, twenty-eight".