9978109 has 4 divisors (see below), whose sum is σ = 10127104. Its totient is φ = 9829116.

The previous prime is 9978103. The next prime is 9978119. The reversal of 9978109 is 9018799.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9978109 - 2¹¹ = 9976061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9978103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74397 + ... + 74530.

It is an arithmetic number, because the mean of its divisors is an integer number (2531776).

Almost surely, 2^9978109 is an apocalyptic number.

It is an amenable number.

9978109 is a deficient number, since it is larger than the sum of its proper divisors (148995).

9978109 is a wasteful number, since it uses less digits than its factorization.

9978109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148994.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 9978109 is about 3158.8144928121. The cubic root of 9978109 is about 215.2861450487.

The spelling of 9978109 in words is "nine million, nine hundred seventy-eight thousand, one hundred nine".