19242389 has 4 divisors (see below), whose sum is σ = 19557900. Its totient is φ = 18926880.

The previous prime is 19242367. The next prime is 19242397. The reversal of 19242389 is 98324291.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9891025 + 9351364 = 3145^2 + 3058^2 .

It is a cyclic number.

It is not a de Polignac number, because 19242389 - 2⁸ = 19242133 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 (19242889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157664 + ... + 157785.

It is an arithmetic number, because the mean of its divisors is an integer number (4889475).

Almost surely, 2^19242389 is an apocalyptic number.

It is an amenable number.

19242389 is a deficient number, since it is larger than the sum of its proper divisors (315511).

19242389 is an equidigital number, since it uses as much as digits as its factorization.

19242389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315510.

The product of its digits is 31104, while the sum is 38.

The square root of 19242389 is about 4386.6147539988. The cubic root of 19242389 is about 267.9700948661.

The spelling of 19242389 in words is "nineteen million, two hundred forty-two thousand, three hundred eighty-nine".