19838609 has 16 divisors (see below), whose sum is σ = 24571008. Its totient is φ = 15628032.

The previous prime is 19838591. The next prime is 19838659. The reversal of 19838609 is 90683891.

It is a de Polignac number, because none of the positive numbers 2^k-19838609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19838609.

It is not an unprimeable number, because it can be changed into a prime (19838659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3179 + ... + 7055.

It is an arithmetic number, because the mean of its divisors is an integer number (1535688).

Almost surely, 2^19838609 is an apocalyptic number.

It is an amenable number.

19838609 is a deficient number, since it is larger than the sum of its proper divisors (4732399).

19838609 is a wasteful number, since it uses less digits than its factorization.

19838609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3944.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 19838609 is about 4454.0553431676. The cubic root of 19838609 is about 270.7096512240.

The spelling of 19838609 in words is "nineteen million, eight hundred thirty-eight thousand, six hundred nine".