432928021 has 4 divisors (see below), whose sum is σ = 434008044. Its totient is φ = 431848000.

The previous prime is 432928007. The next prime is 432928031. The reversal of 432928021 is 120829234.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 431392900 + 1535121 = 20770^2 + 1239^2 .

It is a cyclic number.

It is not a de Polignac number, because 432928021 - 2⁷ = 432927893 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (432928031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 539410 + ... + 540211.

It is an arithmetic number, because the mean of its divisors is an integer number (108502011).

Almost surely, 2^432928021 is an apocalyptic number.

It is an amenable number.

432928021 is a deficient number, since it is larger than the sum of its proper divisors (1080023).

432928021 is a wasteful number, since it uses less digits than its factorization.

432928021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080022.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 432928021 is about 20806.9224298069. The cubic root of 432928021 is about 756.4935544475.

The spelling of 432928021 in words is "four hundred thirty-two million, nine hundred twenty-eight thousand, twenty-one".