9997789 has 8 divisors (see below), whose sum is σ = 10156608. Its totient is φ = 9840480.

The previous prime is 9997787. The next prime is 9997817. The reversal of 9997789 is 9877999.

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

It is a cyclic number.

It is not a de Polignac number, because 9997789 - 2¹ = 9997787 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9997783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21649 + ... + 22105.

It is an arithmetic number, because the mean of its divisors is an integer number (1269576).

Almost surely, 2^9997789 is an apocalyptic number.

It is an amenable number.

9997789 is a deficient number, since it is larger than the sum of its proper divisors (158819).

9997789 is a wasteful number, since it uses less digits than its factorization.

9997789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755.

The product of its digits is 2571912, while the sum is 58.

The square root of 9997789 is about 3161.9280510473. The cubic root of 9997789 is about 215.4275896492.

The spelling of 9997789 in words is "nine million, nine hundred ninety-seven thousand, seven hundred eighty-nine".