11985977 has 2 divisors, whose sum is σ = 11985978. Its totient is φ = 11985976.

The previous prime is 11985971. The next prime is 11985991. The reversal of 11985977 is 77958911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10214416 + 1771561 = 3196^2 + 1331^2 .

It is a cyclic number.

It is not a de Polignac number, because 11985977 - 2²² = 7791673 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11985971) 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 as a sum of consecutive naturals, namely, 5992988 + 5992989.

It is an arithmetic number, because the mean of its divisors is an integer number (5992989).

Almost surely, 2^11985977 is an apocalyptic number.

It is an amenable number.

11985977 is a deficient number, since it is larger than the sum of its proper divisors (1).

11985977 is an equidigital number, since it uses as much as digits as its factorization.

11985977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 47.

The square root of 11985977 is about 3462.0769777693. The cubic root of 11985977 is about 228.8536341511.

The spelling of 11985977 in words is "eleven million, nine hundred eighty-five thousand, nine hundred seventy-seven".