9993761 has 4 divisors (see below), whose sum is σ = 10003332. Its totient is φ = 9984192.

The previous prime is 9993743. The next prime is 9993769. The reversal of 9993761 is 1673999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1673999 = 47 ⋅35617.

It can be written as a sum of positive squares in 2 ways, for example, as 3129361 + 6864400 = 1769^2 + 2620^2 .

It is a cyclic number.

It is not a de Polignac number, because 9993761 - 2¹⁰ = 9992737 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9993769) 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, 2996 + ... + 5381.

It is an arithmetic number, because the mean of its divisors is an integer number (2500833).

Almost surely, 2^9993761 is an apocalyptic number.

It is an amenable number.

9993761 is a deficient number, since it is larger than the sum of its proper divisors (9571).

9993761 is a wasteful number, since it uses less digits than its factorization.

9993761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9570.

The product of its digits is 91854, while the sum is 44.

The square root of 9993761 is about 3161.2910337392. The cubic root of 9993761 is about 215.3986546219.

The spelling of 9993761 in words is "nine million, nine hundred ninety-three thousand, seven hundred sixty-one".