11917993 has 2 divisors, whose sum is σ = 11917994. Its totient is φ = 11917992.

The previous prime is 11917973. The next prime is 11918051. The reversal of 11917993 is 39971911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11471769 + 446224 = 3387^2 + 668^2 .

It is a cyclic number.

It is not a de Polignac number, because 11917993 - 2⁹ = 11917481 is a prime.

It is not a weakly prime, because it can be changed into another prime (11917963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5958996 + 5958997.

It is an arithmetic number, because the mean of its divisors is an integer number (5958997).

Almost surely, 2^11917993 is an apocalyptic number.

It is an amenable number.

11917993 is a deficient number, since it is larger than the sum of its proper divisors (1).

11917993 is an equidigital number, since it uses as much as digits as its factorization.

11917993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15309, while the sum is 40.

The square root of 11917993 is about 3452.2446321198. The cubic root of 11917993 is about 228.4201305097.

The spelling of 11917993 in words is "eleven million, nine hundred seventeen thousand, nine hundred ninety-three".