19289939 has 4 divisors (see below), whose sum is σ = 20128656. Its totient is φ = 18451224.

The previous prime is 19289923. The next prime is 19289953. The reversal of 19289939 is 93998291.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93998291 = 223 ⋅421517.

It is a cyclic number.

It is not a de Polignac number, because 19289939 - 2⁴ = 19289923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19289989) 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, 419324 + ... + 419369.

It is an arithmetic number, because the mean of its divisors is an integer number (5032164).

Almost surely, 2^19289939 is an apocalyptic number.

19289939 is a deficient number, since it is larger than the sum of its proper divisors (838717).

19289939 is an equidigital number, since it uses as much as digits as its factorization.

19289939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838716.

The product of its digits is 314928, while the sum is 50.

The square root of 19289939 is about 4392.0313068101. The cubic root of 19289939 is about 268.1906408839.

The spelling of 19289939 in words is "nineteen million, two hundred eighty-nine thousand, nine hundred thirty-nine".