19728233 has 12 divisors (see below), whose sum is σ = 23025492. Its totient is φ = 16853760.

The previous prime is 19728223. The next prime is 19728239. The reversal of 19728233 is 33282791.

It can be written as a sum of positive squares in 2 ways, for example, as 10413529 + 9314704 = 3227^2 + 3052^2 .

It is not a de Polignac number, because 19728233 - 2⁸ = 19727977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19728193 and 19728202.

It is not an unprimeable number, because it can be changed into a prime (19728239) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21953 + ... + 22833.

It is an arithmetic number, because the mean of its divisors is an integer number (1918791).

Almost surely, 2^19728233 is an apocalyptic number.

It is an amenable number.

19728233 is a deficient number, since it is larger than the sum of its proper divisors (3297259).

19728233 is an equidigital number, since it uses as much as digits as its factorization.

19728233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352 (or 1345 counting only the distinct ones).

The product of its digits is 18144, while the sum is 35.

The square root of 19728233 is about 4441.6475546806. The cubic root of 19728233 is about 270.2066684708.

The spelling of 19728233 in words is "nineteen million, seven hundred twenty-eight thousand, two hundred thirty-three".