19924389 has 12 divisors (see below), whose sum is σ = 29557996. Its totient is φ = 12923712.

The previous prime is 19924367. The next prime is 19924397. The reversal of 19924389 is 98342991.

It can be written as a sum of positive squares in 2 ways, for example, as 18404100 + 1520289 = 4290^2 + 1233^2 .

It is not a de Polignac number, because 19924389 - 2⁸ = 19924133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19924349) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29584 + ... + 30249.

Almost surely, 2^19924389 is an apocalyptic number.

It is an amenable number.

19924389 is a deficient number, since it is larger than the sum of its proper divisors (9633607).

19924389 is a wasteful number, since it uses less digits than its factorization.

19924389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59876 (or 59873 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 19924389 is about 4463.6743832856. The cubic root of 19924389 is about 271.0992633015.

The spelling of 19924389 in words is "nineteen million, nine hundred twenty-four thousand, three hundred eighty-nine".