9819947 has 2 divisors, whose sum is σ = 9819948. Its totient is φ = 9819946.

The previous prime is 9819913. The next prime is 9819959. The reversal of 9819947 is 7499189.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9819947 - 2¹⁰ = 9818923 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9819907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4909973 + 4909974.

It is an arithmetic number, because the mean of its divisors is an integer number (4909974).

Almost surely, 2^9819947 is an apocalyptic number.

9819947 is a deficient number, since it is larger than the sum of its proper divisors (1).

9819947 is an equidigital number, since it uses as much as digits as its factorization.

9819947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 47.

The square root of 9819947 is about 3133.6794666973. The cubic root of 9819947 is about 214.1425884669.

The spelling of 9819947 in words is "nine million, eight hundred nineteen thousand, nine hundred forty-seven".