9139978 has 8 divisors (see below), whose sum is σ = 14152320. Its totient is φ = 4422540.

The previous prime is 9139973. The next prime is 9139981. The reversal of 9139978 is 8799319.

9139978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (9139973) 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, 73648 + ... + 73771.

It is an arithmetic number, because the mean of its divisors is an integer number (1769040).

Almost surely, 2^9139978 is an apocalyptic number.

9139978 is a deficient number, since it is larger than the sum of its proper divisors (5012342).

9139978 is a wasteful number, since it uses less digits than its factorization.

9139978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147452.

The product of its digits is 122472, while the sum is 46.

The square root of 9139978 is about 3023.2396530874. The cubic root of 9139978 is about 209.0812318257.

The spelling of 9139978 in words is "nine million, one hundred thirty-nine thousand, nine hundred seventy-eight".