987775 has 6 divisors (see below), whose sum is σ = 1224872. Its totient is φ = 790200.

The previous prime is 987739. The next prime is 987793. The reversal of 987775 is 577789.

It is not a de Polignac number, because 987775 - 2¹⁷ = 856703 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 19731 + ... + 19780.

2⁹⁸⁷⁷⁷⁵ is an apocalyptic number.

987775 is a deficient number, since it is larger than the sum of its proper divisors (237097).

987775 is a wasteful number, since it uses less digits than its factorization.

987775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39521 (or 39516 counting only the distinct ones).

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

The square root of 987775 is about 993.8687036022. The cubic root of 987775 is about 99.5908280668.

The spelling of 987775 in words is "nine hundred eighty-seven thousand, seven hundred seventy-five".