9978938 has 4 divisors (see below), whose sum is σ = 14968410. Its totient is φ = 4989468.

The previous prime is 9978919. The next prime is 9978959. The reversal of 9978938 is 8398799.

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., 9878449 + 100489 = 3143^2 + 317^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 9978938.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2494733 + ... + 2494736.

Almost surely, 2^9978938 is an apocalyptic number.

9978938 is a deficient number, since it is larger than the sum of its proper divisors (4989472).

9978938 is a wasteful number, since it uses less digits than its factorization.

9978938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4989471.

The product of its digits is 979776, while the sum is 53.

The square root of 9978938 is about 3158.9457102014. The cubic root of 9978938 is about 215.2921070090.

The spelling of 9978938 in words is "nine million, nine hundred seventy-eight thousand, nine hundred thirty-eight".