9878749 has 2 divisors, whose sum is σ = 9878750. Its totient is φ = 9878748.

The previous prime is 9878747. The next prime is 9878773. The reversal of 9878749 is 9478789.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7868025 + 2010724 = 2805^2 + 1418^2 .

It is a cyclic number.

It is not a de Polignac number, because 9878749 - 2¹ = 9878747 is a prime.

Together with 9878747, it forms a pair of twin primes.

It is an alternating number because its digits alternate between odd and even.

9878749 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 9878696 and 9878705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9878747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4939374 + 4939375.

It is an arithmetic number, because the mean of its divisors is an integer number (4939375).

Almost surely, 2^9878749 is an apocalyptic number.

It is an amenable number.

9878749 is a deficient number, since it is larger than the sum of its proper divisors (1).

9878749 is an equidigital number, since it uses as much as digits as its factorization.

9878749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 52.

The square root of 9878749 is about 3143.0477247411. The cubic root of 9878749 is about 214.5691678922.

The spelling of 9878749 in words is "nine million, eight hundred seventy-eight thousand, seven hundred forty-nine".