19389393 has 12 divisors (see below), whose sum is σ = 28091700. Its totient is φ = 12887136.

The previous prime is 19389389. The next prime is 19389407. The reversal of 19389393 is 39398391.

It can be written as a sum of positive squares in 2 ways, for example, as 5461569 + 13927824 = 2337^2 + 3732^2 .

It is not a de Polignac number, because 19389393 - 2² = 19389389 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19389323) 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, 55 + ... + 6227.

It is an arithmetic number, because the mean of its divisors is an integer number (2340975).

Almost surely, 2^19389393 is an apocalyptic number.

It is an amenable number.

19389393 is a deficient number, since it is larger than the sum of its proper divisors (8702307).

19389393 is a wasteful number, since it uses less digits than its factorization.

19389393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6528 (or 6525 counting only the distinct ones).

The product of its digits is 157464, while the sum is 45.

The square root of 19389393 is about 4403.3388468298. The cubic root of 19389393 is about 268.6507585261.

The spelling of 19389393 in words is "nineteen million, three hundred eighty-nine thousand, three hundred ninety-three".