9978305 has 4 divisors (see below), whose sum is σ = 11973972. Its totient is φ = 7982640.

The previous prime is 9978301. The next prime is 9978307. The reversal of 9978305 is 5038799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5038799 = 71 ⋅70969.

It can be written as a sum of positive squares in 2 ways, for example, as 2666689 + 7311616 = 1633^2 + 2704^2 .

It is not a de Polignac number, because 9978305 - 2² = 9978301 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9978301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 997826 + ... + 997835.

It is an arithmetic number, because the mean of its divisors is an integer number (2993493).

Almost surely, 2^9978305 is an apocalyptic number.

It is an amenable number.

9978305 is a deficient number, since it is larger than the sum of its proper divisors (1995667).

9978305 is a wasteful number, since it uses less digits than its factorization.

9978305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1995666.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 9978305 is about 3158.8455169571. The cubic root of 9978305 is about 215.2875546614.

The spelling of 9978305 in words is "nine million, nine hundred seventy-eight thousand, three hundred five".