9978461138 has 8 divisors (see below), whose sum is σ = 14971777788. Its totient is φ = 4987868544.

The previous prime is 9978461113. The next prime is 9978461183. The reversal of 9978461138 is 8311648799.

9978461138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 8954269129 + 1024192009 = 94627^2 + 32003^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 671831 + ... + 686522.

Almost surely, 2^9978461138 is an apocalyptic number.

9978461138 is a deficient number, since it is larger than the sum of its proper divisors (4993316650).

9978461138 is a wasteful number, since it uses less digits than its factorization.

9978461138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362028.

The product of its digits is 2612736, while the sum is 56.

The square root of 9978461138 is about 99892.2476371415. The cubic root of 9978461138 is about 2152.8867757731.

The spelling of 9978461138 in words is "nine billion, nine hundred seventy-eight million, four hundred sixty-one thousand, one hundred thirty-eight".