11953993 has 4 divisors (see below), whose sum is σ = 11963520. Its totient is φ = 11944468.

The previous prime is 11953973. The next prime is 11953999. The reversal of 11953993 is 39935911.

It is the 1412-nd star number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 39935911 = 137 ⋅291503.

It is a cyclic number.

It is not a de Polignac number, because 11953993 - 2⁵ = 11953961 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11953999) 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 3 ways as a sum of consecutive naturals, for example, 2533 + ... + 5506.

It is an arithmetic number, because the mean of its divisors is an integer number (2990880).

Almost surely, 2^11953993 is an apocalyptic number.

It is an amenable number.

11953993 is a deficient number, since it is larger than the sum of its proper divisors (9527).

11953993 is an equidigital number, since it uses as much as digits as its factorization.

11953993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9526.

The product of its digits is 32805, while the sum is 40.

The square root of 11953993 is about 3457.4546996309. The cubic root of 11953993 is about 228.6498911989.

The spelling of 11953993 in words is "eleven million, nine hundred fifty-three thousand, nine hundred ninety-three".