9843921 has 12 divisors (see below), whose sum is σ = 14271348. Its totient is φ = 6538464.

The previous prime is 9843917. The next prime is 9843923. The reversal of 9843921 is 1293489.

9843921 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in 2 ways, for example, as 7700625 + 2143296 = 2775^2 + 1464^2 .

It is not a de Polignac number, because 9843921 - 2² = 9843917 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (9843923) 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 11 ways as a sum of consecutive naturals, for example, 771 + ... + 4503.

It is an arithmetic number, because the mean of its divisors is an integer number (1189279).

Almost surely, 2^9843921 is an apocalyptic number.

It is an amenable number.

9843921 is a deficient number, since it is larger than the sum of its proper divisors (4427427).

9843921 is a wasteful number, since it uses less digits than its factorization.

9843921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4032 (or 4029 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 9843921 is about 3137.5023505967. The cubic root of 9843921 is about 214.3167130393.

The spelling of 9843921 in words is "nine million, eight hundred forty-three thousand, nine hundred twenty-one".