11987893 has 2 divisors, whose sum is σ = 11987894. Its totient is φ = 11987892.

The previous prime is 11987891. The next prime is 11987897. The reversal of 11987893 is 39878911.

It is the 1414-th star number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9746884 + 2241009 = 3122^2 + 1497^2 .

It is an emirp because it is prime and its reverse (39878911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11987893 - 2¹ = 11987891 is a prime.

Together with 11987891, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11987891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5993946 + 5993947.

It is an arithmetic number, because the mean of its divisors is an integer number (5993947).

Almost surely, 2^11987893 is an apocalyptic number.

It is an amenable number.

11987893 is a deficient number, since it is larger than the sum of its proper divisors (1).

11987893 is an equidigital number, since it uses as much as digits as its factorization.

11987893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 46.

The square root of 11987893 is about 3462.3536792188. The cubic root of 11987893 is about 228.8658278505.

It can be divided in two parts, 11987 and 893, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 11987893 in words is "eleven million, nine hundred eighty-seven thousand, eight hundred ninety-three".