19116389 has 4 divisors (see below), whose sum is σ = 19207200. Its totient is φ = 19025580.

The previous prime is 19116379. The next prime is 19116403. The reversal of 19116389 is 98361191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98361191 = 599 ⋅164209.

It is a cyclic number.

It is not a de Polignac number, because 19116389 - 2¹⁶ = 19050853 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 (19116319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45089 + ... + 45510.

It is an arithmetic number, because the mean of its divisors is an integer number (4801800).

Almost surely, 2^19116389 is an apocalyptic number.

It is an amenable number.

19116389 is a deficient number, since it is larger than the sum of its proper divisors (90811).

19116389 is an equidigital number, since it uses as much as digits as its factorization.

19116389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90810.

The product of its digits is 11664, while the sum is 38.

The square root of 19116389 is about 4372.2292940787. The cubic root of 19116389 is about 267.3839202878.

The spelling of 19116389 in words is "nineteen million, one hundred sixteen thousand, three hundred eighty-nine".