9978547 has 2 divisors, whose sum is σ = 9978548. Its totient is φ = 9978546.

The previous prime is 9978461. The next prime is 9978557. The reversal of 9978547 is 7458799.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9978547 - 2¹⁵ = 9945779 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9978547.

It is not a weakly prime, because it can be changed into another prime (9978557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4989273 + 4989274.

It is an arithmetic number, because the mean of its divisors is an integer number (4989274).

Almost surely, 2^9978547 is an apocalyptic number.

9978547 is a deficient number, since it is larger than the sum of its proper divisors (1).

9978547 is an equidigital number, since it uses as much as digits as its factorization.

9978547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 49.

The square root of 9978547 is about 3158.8838218586. The cubic root of 9978547 is about 215.2892950761.

The spelling of 9978547 in words is "nine million, nine hundred seventy-eight thousand, five hundred forty-seven".