987787 has 4 divisors (see below), whose sum is σ = 992160. Its totient is φ = 983416.

The previous prime is 987739. The next prime is 987793. The reversal of 987787 is 787789.

It is a happy number.

987787 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 787789 = 641 ⋅1229.

It is a cyclic number.

It is not a de Polignac number, because 987787 - 2⁷ = 987659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (987797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1828 + ... + 2305.

It is an arithmetic number, because the mean of its divisors is an integer number (248040).

2⁹⁸⁷⁷⁸⁷ is an apocalyptic number.

987787 is a deficient number, since it is larger than the sum of its proper divisors (4373).

987787 is a wasteful number, since it uses less digits than its factorization.

987787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4372.

The product of its digits is 197568, while the sum is 46.

The square root of 987787 is about 993.8747405986. The cubic root of 987787 is about 99.5912313587.

The spelling of 987787 in words is "nine hundred eighty-seven thousand, seven hundred eighty-seven".