9489157978 has 8 divisors (see below), whose sum is σ = 14852595168. Its totient is φ = 4538292924.

The previous prime is 9489157949. The next prime is 9489158027. The reversal of 9489157978 is 8797519849.

9489157978 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 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, 103142976 + ... + 103143067.

It is an arithmetic number, because the mean of its divisors is an integer number (1856574396).

Almost surely, 2^9489157978 is an apocalyptic number.

9489157978 is a deficient number, since it is larger than the sum of its proper divisors (5363437190).

9489157978 is a wasteful number, since it uses less digits than its factorization.

9489157978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206286068.

The product of its digits is 45722880, while the sum is 67.

The square root of 9489157978 is about 97412.3091708640. The cubic root of 9489157978 is about 2117.1057855589.

The spelling of 9489157978 in words is "nine billion, four hundred eighty-nine million, one hundred fifty-seven thousand, nine hundred seventy-eight".