987855 has 16 divisors (see below), whose sum is σ = 1724544. Its totient is φ = 478880.

The previous prime is 987851. The next prime is 987869. The reversal of 987855 is 558789.

It is not a de Polignac number, because 987855 - 2² = 987851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2829 + ... + 3158.

It is an arithmetic number, because the mean of its divisors is an integer number (107784).

2⁹⁸⁷⁸⁵⁵ is an apocalyptic number.

987855 is a deficient number, since it is larger than the sum of its proper divisors (736689).

987855 is a wasteful number, since it uses less digits than its factorization.

987855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6006.

The product of its digits is 100800, while the sum is 42.

The square root of 987855 is about 993.9089495522. The cubic root of 987855 is about 99.5935166180.

It can be divided in two parts, 98785 and 5, that added together give a triangular number (98790 = T₄₄₄).

The spelling of 987855 in words is "nine hundred eighty-seven thousand, eight hundred fifty-five".