1928933221 has 8 divisors (see below), whose sum is σ = 1949392640. Its totient is φ = 1908507312.

The previous prime is 1928933189. The next prime is 1928933269. The reversal of 1928933221 is 1223398291.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1928933221 - 2⁵ = 1928933189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1928933291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117220 + ... + 132658.

It is an arithmetic number, because the mean of its divisors is an integer number (243674080).

Almost surely, 2^1928933221 is an apocalyptic number.

It is an amenable number.

1928933221 is a deficient number, since it is larger than the sum of its proper divisors (20459419).

1928933221 is a wasteful number, since it uses less digits than its factorization.

1928933221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16755.

The product of its digits is 46656, while the sum is 40.

The square root of 1928933221 is about 43919.6222775196. The cubic root of 1928933221 is about 1244.8176312825.

The spelling of 1928933221 in words is "one billion, nine hundred twenty-eight million, nine hundred thirty-three thousand, two hundred twenty-one".