19389239 has 4 divisors (see below), whose sum is σ = 19801824. Its totient is φ = 18976656.

The previous prime is 19389211. The next prime is 19389241. The reversal of 19389239 is 93298391.

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

It is a cyclic number.

It is not a de Polignac number, because 19389239 - 2¹² = 19385143 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19389239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19389289) 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, 206222 + ... + 206315.

It is an arithmetic number, because the mean of its divisors is an integer number (4950456).

Almost surely, 2^19389239 is an apocalyptic number.

19389239 is a deficient number, since it is larger than the sum of its proper divisors (412585).

19389239 is an equidigital number, since it uses as much as digits as its factorization.

19389239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412584.

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

The square root of 19389239 is about 4403.3213600645. The cubic root of 19389239 is about 268.6500472725.

The spelling of 19389239 in words is "nineteen million, three hundred eighty-nine thousand, two hundred thirty-nine".