19794947 has 4 divisors (see below), whose sum is σ = 19812480. Its totient is φ = 19777416.

The previous prime is 19794937. The next prime is 19794959. The reversal of 19794947 is 74949791.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19794947 - 2¹⁸ = 19532803 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19794895 and 19794904.

It is not an unprimeable number, because it can be changed into a prime (19794937) 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, 6947 + ... + 9372.

It is an arithmetic number, because the mean of its divisors is an integer number (4953120).

Almost surely, 2^19794947 is an apocalyptic number.

19794947 is a deficient number, since it is larger than the sum of its proper divisors (17533).

19794947 is a wasteful number, since it uses less digits than its factorization.

19794947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17532.

The product of its digits is 571536, while the sum is 50.

The square root of 19794947 is about 4449.1512673767. The cubic root of 19794947 is about 270.5109073403.

The spelling of 19794947 in words is "nineteen million, seven hundred ninety-four thousand, nine hundred forty-seven".