9803991 has 8 divisors (see below), whose sum is σ = 13094784. Its totient is φ = 6524600.

The previous prime is 9803987. The next prime is 9803999. The reversal of 9803991 is 1993089.

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

It is a cyclic number.

It is not a de Polignac number, because 9803991 - 2² = 9803987 is a prime.

It is a super-2 number, since 2×9803991² = 192236479056162, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9803999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 585 + ... + 4466.

It is an arithmetic number, because the mean of its divisors is an integer number (1636848).

Almost surely, 2^9803991 is an apocalyptic number.

9803991 is a deficient number, since it is larger than the sum of its proper divisors (3290793).

9803991 is a wasteful number, since it uses less digits than its factorization.

9803991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5701.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 9803991 is about 3131.1325427072. The cubic root of 9803991 is about 214.0265419666.

The spelling of 9803991 in words is "nine million, eight hundred three thousand, nine hundred ninety-one".