9947778 has 8 divisors (see below), whose sum is σ = 19895568. Its totient is φ = 3315924.

The previous prime is 9947761. The next prime is 9947779. The reversal of 9947778 is 8777499.

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

9947778 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 9947778.

It is not an unprimeable number, because it can be changed into a prime (9947779) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 828976 + ... + 828987.

It is an arithmetic number, because the mean of its divisors is an integer number (2486946).

Almost surely, 2^9947778 is an apocalyptic number.

9947778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

9947778 is a wasteful number, since it uses less digits than its factorization.

9947778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1657968.

The product of its digits is 889056, while the sum is 51.

The square root of 9947778 is about 3154.0098287735. The cubic root of 9947778 is about 215.0677846481.

The spelling of 9947778 in words is "nine million, nine hundred forty-seven thousand, seven hundred seventy-eight".