19728042 has 16 divisors (see below), whose sum is σ = 41532960. Its totient is φ = 6229872.

The previous prime is 19728017. The next prime is 19728073. The reversal of 19728042 is 24082791.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19727994 and 19728012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86413 + ... + 86640.

It is an arithmetic number, because the mean of its divisors is an integer number (2595810).

Almost surely, 2^19728042 is an apocalyptic number.

19728042 is an abundant number, since it is smaller than the sum of its proper divisors (21804918).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19728042 is a wasteful number, since it uses less digits than its factorization.

19728042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173077.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 19728042 is about 4441.6260535979. The cubic root of 19728042 is about 270.2057964610.

The spelling of 19728042 in words is "nineteen million, seven hundred twenty-eight thousand, forty-two".