987870365 has 4 divisors (see below), whose sum is σ = 1185444444. Its totient is φ = 790296288.

The previous prime is 987870361. The next prime is 987870409. The reversal of 987870365 is 563078789.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 260273689 + 727596676 = 16133^2 + 26974^2 .

It is a cyclic number.

It is not a de Polignac number, because 987870365 - 2² = 987870361 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987870361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98787032 + ... + 98787041.

It is an arithmetic number, because the mean of its divisors is an integer number (296361111).

Almost surely, 2^987870365 is an apocalyptic number.

It is an amenable number.

987870365 is a deficient number, since it is larger than the sum of its proper divisors (197574079).

987870365 is a wasteful number, since it uses less digits than its factorization.

987870365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197574078.

The product of its (nonzero) digits is 2540160, while the sum is 53.

The square root of 987870365 is about 31430.4051039754. The cubic root of 987870365 is about 995.9403297129.

The spelling of 987870365 in words is "nine hundred eighty-seven million, eight hundred seventy thousand, three hundred sixty-five".