9923861 has 2 divisors, whose sum is σ = 9923862. Its totient is φ = 9923860.

The previous prime is 9923831. The next prime is 9923891. The reversal of 9923861 is 1683299.

It is a balanced prime because it is at equal distance from previous prime (9923831) and next prime (9923891).

It can be written as a sum of positive squares in only one way, i.e., 7980625 + 1943236 = 2825^2 + 1394^2 .

It is an emirp because it is prime and its reverse (1683299) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9923861 - 2¹⁴ = 9907477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9923821) 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 as a sum of consecutive naturals, namely, 4961930 + 4961931.

It is an arithmetic number, because the mean of its divisors is an integer number (4961931).

Almost surely, 2^9923861 is an apocalyptic number.

It is an amenable number.

9923861 is a deficient number, since it is larger than the sum of its proper divisors (1).

9923861 is an equidigital number, since it uses as much as digits as its factorization.

9923861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 38.

The square root of 9923861 is about 3150.2160243386. The cubic root of 9923861 is about 214.8952870297.

It can be divided in two parts, 99238 and 61, that added together give a palindrome (99299).

The spelling of 9923861 in words is "nine million, nine hundred twenty-three thousand, eight hundred sixty-one".