19828609 has 8 divisors (see below), whose sum is σ = 20917440. Its totient is φ = 18744336.

The previous prime is 19828607. The next prime is 19828619. The reversal of 19828609 is 90682891.

It is a happy number.

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

It is not a de Polignac number, because 19828609 - 2¹ = 19828607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19828607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11487 + ... + 13099.

It is an arithmetic number, because the mean of its divisors is an integer number (2614680).

Almost surely, 2^19828609 is an apocalyptic number.

19828609 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

19828609 is a deficient number, since it is larger than the sum of its proper divisors (1088831).

19828609 is a wasteful number, since it uses less digits than its factorization.

19828609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2279.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 19828609 is about 4452.9326291782. The cubic root of 19828609 is about 270.6641582580.

The spelling of 19828609 in words is "nineteen million, eight hundred twenty-eight thousand, six hundred nine".