987009845 has 4 divisors (see below), whose sum is σ = 1184411820. Its totient is φ = 789607872.

The previous prime is 987009841. The next prime is 987009857. The reversal of 987009845 is 548900789.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 548900789 = 1049 ⋅523261.

It can be written as a sum of positive squares in 2 ways, for example, as 627452401 + 359557444 = 25049^2 + 18962^2 .

It is a cyclic number.

It is not a de Polignac number, because 987009845 - 2² = 987009841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 987009793 and 987009802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987009841) 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, 98700980 + ... + 98700989.

It is an arithmetic number, because the mean of its divisors is an integer number (296102955).

Almost surely, 2^987009845 is an apocalyptic number.

It is an amenable number.

987009845 is a deficient number, since it is larger than the sum of its proper divisors (197401975).

987009845 is a wasteful number, since it uses less digits than its factorization.

987009845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197401974.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 987009845 is about 31416.7128293206. The cubic root of 987009845 is about 995.6510624934.

The spelling of 987009845 in words is "nine hundred eighty-seven million, nine thousand, eight hundred forty-five".