19428005 has 8 divisors (see below), whose sum is σ = 23340312. Its totient is φ = 15524608.

The previous prime is 19427953. The next prime is 19428011. The reversal of 19428005 is 50082491.

It can be written as a sum of positive squares in 4 ways, for example, as 4919524 + 14508481 = 2218^2 + 3809^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 19428005 - 2²⁴ = 2650789 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 4337 + ... + 7593.

It is an arithmetic number, because the mean of its divisors is an integer number (2917539).

Almost surely, 2^19428005 is an apocalyptic number.

It is an amenable number.

19428005 is a deficient number, since it is larger than the sum of its proper divisors (3912307).

19428005 is a wasteful number, since it uses less digits than its factorization.

19428005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4455.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 19428005 is about 4407.7210664923. The cubic root of 19428005 is about 268.8289704830.

The spelling of 19428005 in words is "nineteen million, four hundred twenty-eight thousand, five".