11905987 has 2 divisors, whose sum is σ = 11905988. Its totient is φ = 11905986.

The previous prime is 11905937. The next prime is 11905991. The reversal of 11905987 is 78950911.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11905987 - 2¹¹ = 11903939 is a prime.

It is not a weakly prime, because it can be changed into another prime (11905937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5952993 + 5952994.

It is an arithmetic number, because the mean of its divisors is an integer number (5952994).

Almost surely, 2^11905987 is an apocalyptic number.

11905987 is a deficient number, since it is larger than the sum of its proper divisors (1).

11905987 is an equidigital number, since it uses as much as digits as its factorization.

11905987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 11905987 is about 3450.5053253111. The cubic root of 11905987 is about 228.3434024484.

The spelling of 11905987 in words is "eleven million, nine hundred five thousand, nine hundred eighty-seven".