19785442 has 8 divisors (see below), whose sum is σ = 29721600. Its totient is φ = 9878244.

The previous prime is 19785427. The next prime is 19785443. The reversal of 19785442 is 24458791.

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

It is a junction number, because it is equal to n+sod(n) for n = 19785395 and 19785404.

It is not an unprimeable number, because it can be changed into a prime (19785443) 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, 5442 + ... + 8317.

It is an arithmetic number, because the mean of its divisors is an integer number (3715200).

Almost surely, 2^19785442 is an apocalyptic number.

19785442 is a deficient number, since it is larger than the sum of its proper divisors (9936158).

19785442 is a wasteful number, since it uses less digits than its factorization.

19785442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14480.

The product of its digits is 80640, while the sum is 40.

The square root of 19785442 is about 4448.0829578595. The cubic root of 19785442 is about 270.4676030596.

The spelling of 19785442 in words is "nineteen million, seven hundred eighty-five thousand, four hundred forty-two".