19919389 has 8 divisors (see below), whose sum is σ = 22932288. Its totient is φ = 16948320.

The previous prime is 19919387. The next prime is 19919401. The reversal of 19919389 is 98391991.

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 19919389 - 2¹ = 19919387 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 (19919387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9427 + ... + 11344.

It is an arithmetic number, because the mean of its divisors is an integer number (2866536).

Almost surely, 2^19919389 is an apocalyptic number.

It is an amenable number.

19919389 is a deficient number, since it is larger than the sum of its proper divisors (3012899).

19919389 is a wasteful number, since it uses less digits than its factorization.

19919389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20915.

The product of its digits is 157464, while the sum is 49.

The square root of 19919389 is about 4463.1142714477. The cubic root of 19919389 is about 271.0765840662.

The spelling of 19919389 in words is "nineteen million, nine hundred nineteen thousand, three hundred eighty-nine".