19814728 has 32 divisors (see below), whose sum is σ = 38001600. Its totient is φ = 9684288.

The previous prime is 19814723. The next prime is 19814747. The reversal of 19814728 is 82741891.

It is a happy number.

It is a super-3 number, since 3×19814728³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (19814723) by changing a digit.

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, 114450 + ... + 114622.

It is an arithmetic number, because the mean of its divisors is an integer number (1187550).

Almost surely, 2^19814728 is an apocalyptic number.

It is an amenable number.

19814728 is a deficient number, since it is larger than the sum of its proper divisors (18186872).

19814728 is a wasteful number, since it uses less digits than its factorization.

19814728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421 (or 417 counting only the distinct ones).

The product of its digits is 32256, while the sum is 40.

The square root of 19814728 is about 4451.3737205496. The cubic root of 19814728 is about 270.6009841134.

The spelling of 19814728 in words is "nineteen million, eight hundred fourteen thousand, seven hundred twenty-eight".