987649 has 16 divisors (see below), whose sum is σ = 1164240. Its totient is φ = 829440.

The previous prime is 987631. The next prime is 987659. The reversal of 987649 is 946789.

It can be written as a sum of positive squares in 8 ways, for example, as 50625 + 937024 = 225^2 + 968^2 .

It is a cyclic number.

It is not a de Polignac number, because 987649 - 2¹¹ = 985601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9007 + ... + 9115.

It is an arithmetic number, because the mean of its divisors is an integer number (72765).

2⁹⁸⁷⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

987649 is a deficient number, since it is larger than the sum of its proper divisors (176591).

987649 is a wasteful number, since it uses less digits than its factorization.

987649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180.

The product of its digits is 108864, while the sum is 43.

The square root of 987649 is about 993.8053129260. The cubic root of 987649 is about 99.5865933041.

The spelling of 987649 in words is "nine hundred eighty-seven thousand, six hundred forty-nine".