19728357 has 16 divisors (see below), whose sum is σ = 29365248. Its totient is φ = 11677680.

The previous prime is 19728337. The next prime is 19728367. The reversal of 19728357 is 75382791.

It is not a de Polignac number, because 19728357 - 2⁸ = 19728101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19728337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5533 + ... + 8370.

It is an arithmetic number, because the mean of its divisors is an integer number (1835328).

Almost surely, 2^19728357 is an apocalyptic number.

It is an amenable number.

19728357 is a deficient number, since it is larger than the sum of its proper divisors (9636891).

19728357 is a wasteful number, since it uses less digits than its factorization.

19728357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13960.

The product of its digits is 105840, while the sum is 42.

The square root of 19728357 is about 4441.6615134429. The cubic root of 19728357 is about 270.2072345894.

The spelling of 19728357 in words is "nineteen million, seven hundred twenty-eight thousand, three hundred fifty-seven".