19789442 has 4 divisors (see below), whose sum is σ = 29684166. Its totient is φ = 9894720.

The previous prime is 19789433. The next prime is 19789457. The reversal of 19789442 is 24498791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24498791 = 757 ⋅32363.

It can be written as a sum of positive squares in only one way, i.e., 13830961 + 5958481 = 3719^2 + 2441^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19789393 and 19789402.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4947359 + ... + 4947362.

Almost surely, 2^19789442 is an apocalyptic number.

19789442 is a deficient number, since it is larger than the sum of its proper divisors (9894724).

19789442 is an equidigital number, since it uses as much as digits as its factorization.

19789442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9894723.

The product of its digits is 145152, while the sum is 44.

The square root of 19789442 is about 4448.5325670383. The cubic root of 19789442 is about 270.4858285393.

The spelling of 19789442 in words is "nineteen million, seven hundred eighty-nine thousand, four hundred forty-two".