9809978 has 4 divisors (see below), whose sum is σ = 14714970. Its totient is φ = 4904988.

The previous prime is 9809971. The next prime is 9810001. The reversal of 9809978 is 8799089.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 8958049 + 851929 = 2993^2 + 923^2 .

It is not an unprimeable number, because it can be changed into a prime (9809971) 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 as a sum of consecutive naturals, namely, 2452493 + ... + 2452496.

Almost surely, 2^9809978 is an apocalyptic number.

9809978 is a deficient number, since it is larger than the sum of its proper divisors (4904992).

9809978 is a wasteful number, since it uses less digits than its factorization.

9809978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4904991.

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 9809978 is about 3132.0884406415. The cubic root of 9809978 is about 214.0700996077.

The spelling of 9809978 in words is "nine million, eight hundred nine thousand, nine hundred seventy-eight".