9989919 has 8 divisors (see below), whose sum is σ = 14799920. Its totient is φ = 6659928.

The previous prime is 9989899. The next prime is 9989921. The reversal of 9989919 is 9199899.

It is not a de Polignac number, because 9989919 - 2⁵ = 9989887 is a prime.

It is a super-2 number, since 2×9989919² = 199596963253122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9981919) 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, 184972 + ... + 185025.

It is an arithmetic number, because the mean of its divisors is an integer number (1849990).

Almost surely, 2^9989919 is an apocalyptic number.

9989919 is a deficient number, since it is larger than the sum of its proper divisors (4810001).

9989919 is a wasteful number, since it uses less digits than its factorization.

9989919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370006 (or 370000 counting only the distinct ones).

The product of its digits is 472392, while the sum is 54.

The square root of 9989919 is about 3160.6833121969. The cubic root of 9989919 is about 215.3710484750.

The spelling of 9989919 in words is "nine million, nine hundred eighty-nine thousand, nine hundred nineteen".