9841989 has 4 divisors (see below), whose sum is σ = 13122656. Its totient is φ = 6561324.

The previous prime is 9841987. The next prime is 9842011. The reversal of 9841989 is 9891489.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9891489 = 3 ⋅3297163.

It is not a de Polignac number, because 9841989 - 2¹ = 9841987 is a prime.

It is a super-2 number, since 2×9841989² = 193729494952242, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9841987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1640329 + ... + 1640334.

It is an arithmetic number, because the mean of its divisors is an integer number (3280664).

Almost surely, 2^9841989 is an apocalyptic number.

It is an amenable number.

9841989 is a deficient number, since it is larger than the sum of its proper divisors (3280667).

9841989 is a wasteful number, since it uses less digits than its factorization.

9841989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3280666.

The product of its digits is 186624, while the sum is 48.

The square root of 9841989 is about 3137.1944472729. The cubic root of 9841989 is about 214.3026912899.

The spelling of 9841989 in words is "nine million, eight hundred forty-one thousand, nine hundred eighty-nine".