9997889 has 8 divisors (see below), whose sum is σ = 11016000. Its totient is φ = 8998000.

The previous prime is 9997879. The next prime is 9997913. The reversal of 9997889 is 9887999.

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

It is not a de Polignac number, because 9997889 - 2⁴ = 9997873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9997829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3389 + ... + 5610.

It is an arithmetic number, because the mean of its divisors is an integer number (1377000).

Almost surely, 2^9997889 is an apocalyptic number.

It is an amenable number.

9997889 is a deficient number, since it is larger than the sum of its proper divisors (1018111).

9997889 is a wasteful number, since it uses less digits than its factorization.

9997889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9111.

The product of its digits is 2939328, while the sum is 59.

The square root of 9997889 is about 3161.9438641443. The cubic root of 9997889 is about 215.4283078975.

It can be divided in two parts, 999 and 7889, that added together give a palindrome (8888).

The spelling of 9997889 in words is "nine million, nine hundred ninety-seven thousand, eight hundred eighty-nine".