9993861 has 14 divisors (see below), whose sum is σ = 14985030. Its totient is φ = 6662088.

The previous prime is 9993857. The next prime is 9993869. The reversal of 9993861 is 1683999.

9993861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 9641025 + 352836 = 3105^2 + 594^2 .

It is not a de Polignac number, because 9993861 - 2² = 9993857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9993869) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 6126 + ... + 7583.

Almost surely, 2^9993861 is an apocalyptic number.

It is an amenable number.

9993861 is a deficient number, since it is larger than the sum of its proper divisors (4991169).

9993861 is an equidigital number, since it uses as much as digits as its factorization.

9993861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13727 (or 13712 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 9993861 is about 3161.3068500226. The cubic root of 9993861 is about 215.3993730633.

It can be divided in two parts, 99938 and 61, that added together give a palindrome (99999).

The spelling of 9993861 in words is "nine million, nine hundred ninety-three thousand, eight hundred sixty-one".