9778943 has 2 divisors, whose sum is σ = 9778944. Its totient is φ = 9778942.

The previous prime is 9778913. The next prime is 9778963. The reversal of 9778943 is 3498779.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9778943 - 2⁸ = 9778687 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9778913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4889471 + 4889472.

It is an arithmetic number, because the mean of its divisors is an integer number (4889472).

Almost surely, 2^9778943 is an apocalyptic number.

9778943 is a deficient number, since it is larger than the sum of its proper divisors (1).

9778943 is an equidigital number, since it uses as much as digits as its factorization.

9778943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 47.

The square root of 9778943 is about 3127.1301539910. The cubic root of 9778943 is about 213.8441159584.

The spelling of 9778943 in words is "nine million, seven hundred seventy-eight thousand, nine hundred forty-three".