9879989 has 4 divisors (see below), whose sum is σ = 11291424. Its totient is φ = 8468556.

The previous prime is 9879983. The next prime is 9879997. The reversal of 9879989 is 9899789.

9879989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9879989 - 2¹² = 9875893 is a prime.

It is a super-2 number, since 2×9879989² = 195228365280242, 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 (9879983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705707 + ... + 705720.

It is an arithmetic number, because the mean of its divisors is an integer number (2822856).

Almost surely, 2^9879989 is an apocalyptic number.

It is an amenable number.

9879989 is a deficient number, since it is larger than the sum of its proper divisors (1411435).

9879989 is a wasteful number, since it uses less digits than its factorization.

9879989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411434.

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

The square root of 9879989 is about 3143.2449793168. The cubic root of 9879989 is about 214.5781452312.

The spelling of 9879989 in words is "nine million, eight hundred seventy-nine thousand, nine hundred eighty-nine".