9943989 has 8 divisors (see below), whose sum is σ = 14464032. Its totient is φ = 6026640.

The previous prime is 9943957. The next prime is 9943993. The reversal of 9943989 is 9893499.

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

It is not a de Polignac number, because 9943989 - 2⁵ = 9943957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9943949) 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, 150634 + ... + 150699.

It is an arithmetic number, because the mean of its divisors is an integer number (1808004).

Almost surely, 2^9943989 is an apocalyptic number.

It is an amenable number.

9943989 is a deficient number, since it is larger than the sum of its proper divisors (4520043).

9943989 is a wasteful number, since it uses less digits than its factorization.

9943989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301347.

The product of its digits is 629856, while the sum is 51.

The square root of 9943989 is about 3153.4091076167. The cubic root of 9943989 is about 215.0404755237.

The spelling of 9943989 in words is "nine million, nine hundred forty-three thousand, nine hundred eighty-nine".