775987 has 2 divisors, whose sum is σ = 775988. Its totient is φ = 775986.

The previous prime is 775963. The next prime is 776003. The reversal of 775987 is 789577.

It is a strong prime.

It is an emirp because it is prime and its reverse (789577) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 775987 - 2¹¹ = 773939 is a prime.

It is not a weakly prime, because it can be changed into another prime (775937) 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, 387993 + 387994.

It is an arithmetic number, because the mean of its divisors is an integer number (387994).

2⁷⁷⁵⁹⁸⁷ is an apocalyptic number.

775987 is a deficient number, since it is larger than the sum of its proper divisors (1).

775987 is an equidigital number, since it uses as much as digits as its factorization.

775987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 123480, while the sum is 43.

The square root of 775987 is about 880.9012430460. The cubic root of 775987 is about 91.8935046874.

The spelling of 775987 in words is "seven hundred seventy-five thousand, nine hundred eighty-seven".