19728853 has 2 divisors, whose sum is σ = 19728854. Its totient is φ = 19728852.

The previous prime is 19728847. The next prime is 19728883. The reversal of 19728853 is 35882791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14607684 + 5121169 = 3822^2 + 2263^2 .

It is a cyclic number.

It is not a de Polignac number, because 19728853 - 2¹³ = 19720661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19728883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9864426 + 9864427.

It is an arithmetic number, because the mean of its divisors is an integer number (9864427).

Almost surely, 2^19728853 is an apocalyptic number.

It is an amenable number.

19728853 is a deficient number, since it is larger than the sum of its proper divisors (1).

19728853 is an equidigital number, since it uses as much as digits as its factorization.

19728853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 43.

The square root of 19728853 is about 4441.7173480536. The cubic root of 19728853 is about 270.2094990399.

The spelling of 19728853 in words is "nineteen million, seven hundred twenty-eight thousand, eight hundred fifty-three".