9138978 has 24 divisors (see below), whose sum is σ = 20082816. Its totient is φ = 3003000.

The previous prime is 9138967. The next prime is 9138991. The reversal of 9138978 is 8798319.

It is a Curzon number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 2298 + ... + 4853.

It is an arithmetic number, because the mean of its divisors is an integer number (836784).

Almost surely, 2^9138978 is an apocalyptic number.

9138978 is an abundant number, since it is smaller than the sum of its proper divisors (10943838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9138978 is a wasteful number, since it uses less digits than its factorization.

9138978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7230 (or 7227 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 9138978 is about 3023.0742630640. The cubic root of 9138978 is about 209.0736063931.

The spelling of 9138978 in words is "nine million, one hundred thirty-eight thousand, nine hundred seventy-eight".