19239389 has 8 divisors (see below), whose sum is σ = 20925912. Its totient is φ = 17582400.

The previous prime is 19239347. The next prime is 19239391. The reversal of 19239389 is 98393291.

It can be written as a sum of positive squares in 4 ways, for example, as 7198489 + 12040900 = 2683^2 + 3470^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19239389 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 (19239089) 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 7 ways as a sum of consecutive naturals, for example, 6014 + ... + 8639.

It is an arithmetic number, because the mean of its divisors is an integer number (2615739).

Almost surely, 2^19239389 is an apocalyptic number.

It is an amenable number.

19239389 is a deficient number, since it is larger than the sum of its proper divisors (1686523).

19239389 is a wasteful number, since it uses less digits than its factorization.

19239389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14767.

The product of its digits is 104976, while the sum is 44.

The square root of 19239389 is about 4386.2727913343. The cubic root of 19239389 is about 267.9561681119.

The spelling of 19239389 in words is "nineteen million, two hundred thirty-nine thousand, three hundred eighty-nine".