19969609 has 8 divisors (see below), whose sum is σ = 21853728. Its totient is φ = 18096960.

The previous prime is 19969591. The next prime is 19969633. The reversal of 19969609 is 90696991.

It is a happy number.

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 19969609 - 2⁹ = 19969097 is a prime.

It is a super-2 number, since 2×19969609² = 797570567225762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19969639) 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, 1014 + ... + 6400.

It is an arithmetic number, because the mean of its divisors is an integer number (2731716).

Almost surely, 2^19969609 is an apocalyptic number.

It is an amenable number.

19969609 is a deficient number, since it is larger than the sum of its proper divisors (1884119).

19969609 is a wasteful number, since it uses less digits than its factorization.

19969609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5735.

The product of its (nonzero) digits is 236196, while the sum is 49.

The square root of 19969609 is about 4468.7368461345. The cubic root of 19969609 is about 271.3042021835.

The spelling of 19969609 in words is "nineteen million, nine hundred sixty-nine thousand, six hundred nine".