19924169409 has 9 divisors (see below), whose sum is σ = 28779967489. Its totient is φ = 13282497300.

The previous prime is 19924169401. The next prime is 19924169413. The reversal of 19924169409 is 90496142991.

The square root of 19924169409 is 141153.

It is a perfect power (a square), and thus also a powerful number.

19924169409 is a `hidden beast` number, since 199 + 2 + 41 + 6 + 9 + 409 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 19924169409 - 2³ = 19924169401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19924169401) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 399934 + ... + 446984.

Almost surely, 2^19924169409 is an apocalyptic number.

19924169409 is the 141153-rd square number.

19924169409 is the 70577-th centered octagonal number.

It is an amenable number.

19924169409 is a deficient number, since it is larger than the sum of its proper divisors (8855798080).

19924169409 is an frugal number, since it uses more digits than its factorization.

19924169409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94108 (or 47054 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The spelling of 19924169409 in words is "nineteen billion, nine hundred twenty-four million, one hundred sixty-nine thousand, four hundred nine".