19788994 has 8 divisors (see below), whose sum is σ = 31245840. Its totient is φ = 9373716.

The previous prime is 19788983. The next prime is 19788997. The reversal of 19788994 is 49988791.

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

It is not an unprimeable number, because it can be changed into a prime (19788997) 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, 260344 + ... + 260419.

It is an arithmetic number, because the mean of its divisors is an integer number (3905730).

Almost surely, 2^19788994 is an apocalyptic number.

19788994 is a deficient number, since it is larger than the sum of its proper divisors (11456846).

19788994 is a wasteful number, since it uses less digits than its factorization.

19788994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520784.

The product of its digits is 1306368, while the sum is 55.

The square root of 19788994 is about 4448.4822130700. The cubic root of 19788994 is about 270.4837874077.

The spelling of 19788994 in words is "nineteen million, seven hundred eighty-eight thousand, nine hundred ninety-four".