987845 has 4 divisors (see below), whose sum is σ = 1185420. Its totient is φ = 790272.

The previous prime is 987821. The next prime is 987851. The reversal of 987845 is 548789.

987845 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: 548789 = 293 ⋅1873.

It can be written as a sum of positive squares in 2 ways, for example, as 667489 + 320356 = 817^2 + 566^2 .

It is a cyclic number.

It is not a de Polignac number, because 987845 - 2¹⁶ = 922309 is a prime.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 987845.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98780 + ... + 98789.

It is an arithmetic number, because the mean of its divisors is an integer number (296355).

2⁹⁸⁷⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

987845 is a deficient number, since it is larger than the sum of its proper divisors (197575).

987845 is a wasteful number, since it uses less digits than its factorization.

987845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197574.

The product of its digits is 80640, while the sum is 41.

The square root of 987845 is about 993.9039188976. The cubic root of 987845 is about 99.5931805571.

It can be divided in two parts, 98784 and 5, that added together give a palindrome (98789).

The spelling of 987845 in words is "nine hundred eighty-seven thousand, eight hundred forty-five".