11897993 has 2 divisors, whose sum is σ = 11897994. Its totient is φ = 11897992.

The previous prime is 11897957. The next prime is 11898001. The reversal of 11897993 is 39979811.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11744329 + 153664 = 3427^2 + 392^2 .

It is a cyclic number.

It is not a de Polignac number, because 11897993 - 2¹⁸ = 11635849 is a prime.

It is not a weakly prime, because it can be changed into another prime (11897393) 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 as a sum of consecutive naturals, namely, 5948996 + 5948997.

It is an arithmetic number, because the mean of its divisors is an integer number (5948997).

Almost surely, 2^11897993 is an apocalyptic number.

It is an amenable number.

11897993 is a deficient number, since it is larger than the sum of its proper divisors (1).

11897993 is an equidigital number, since it uses as much as digits as its factorization.

11897993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 47.

The square root of 11897993 is about 3449.3467497484. The cubic root of 11897993 is about 228.2922857050.

The spelling of 11897993 in words is "eleven million, eight hundred ninety-seven thousand, nine hundred ninety-three".