19428521 has 8 divisors (see below), whose sum is σ = 22969920. Its totient is φ = 16078608.

The previous prime is 19428517. The next prime is 19428533. The reversal of 19428521 is 12582491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19428521 - 2² = 19428517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19428551) 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, 47651 + ... + 48056.

It is an arithmetic number, because the mean of its divisors is an integer number (2871240).

Almost surely, 2^19428521 is an apocalyptic number.

It is an amenable number.

19428521 is a deficient number, since it is larger than the sum of its proper divisors (3541399).

19428521 is an equidigital number, since it uses as much as digits as its factorization.

19428521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95743.

The product of its digits is 5760, while the sum is 32.

The square root of 19428521 is about 4407.7795997531. The cubic root of 19428521 is about 268.8313504584.

The spelling of 19428521 in words is "nineteen million, four hundred twenty-eight thousand, five hundred twenty-one".