11405987 has 2 divisors, whose sum is σ = 11405988. Its totient is φ = 11405986.

The previous prime is 11405983. The next prime is 11406001. The reversal of 11405987 is 78950411.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11405987 - 2² = 11405983 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11405981) 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, 5702993 + 5702994.

It is an arithmetic number, because the mean of its divisors is an integer number (5702994).

Almost surely, 2^11405987 is an apocalyptic number.

11405987 is a deficient number, since it is larger than the sum of its proper divisors (1).

11405987 is an equidigital number, since it uses as much as digits as its factorization.

11405987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 11405987 is about 3377.2750850353. The cubic root of 11405987 is about 225.1011035336.

The spelling of 11405987 in words is "eleven million, four hundred five thousand, nine hundred eighty-seven".