19788947 has 8 divisors (see below), whose sum is σ = 20912640. Its totient is φ = 18687240.

The previous prime is 19788941. The next prime is 19788953. The reversal of 19788947 is 74988791.

It is an interprime number because it is at equal distance from previous prime (19788941) and next prime (19788953).

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

It is a cyclic number.

It is not a de Polignac number, because 19788947 - 2⁴ = 19788931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19788941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3629 + ... + 7262.

It is an arithmetic number, because the mean of its divisors is an integer number (2614080).

Almost surely, 2^19788947 is an apocalyptic number.

19788947 is a deficient number, since it is larger than the sum of its proper divisors (1123693).

19788947 is a wasteful number, since it uses less digits than its factorization.

19788947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10993.

The product of its digits is 1016064, while the sum is 53.

The square root of 19788947 is about 4448.4769303662. The cubic root of 19788947 is about 270.4835732693.

The spelling of 19788947 in words is "nineteen million, seven hundred eighty-eight thousand, nine hundred forty-seven".