987309 has 24 divisors (see below), whose sum is σ = 1572480. Its totient is φ = 616896.

The previous prime is 987299. The next prime is 987313. The reversal of 987309 is 903789.

987309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 987309 - 2⁴ = 987293 is a prime.

It is a super-2 number, since 2×987309² = 1949558122962, which contains 22 as substring.

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 987309.

It is not an unprimeable number, because it can be changed into a prime (987209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4012 + ... + 4250.

It is an arithmetic number, because the mean of its divisors is an integer number (65520).

2⁹⁸⁷³⁰⁹ is an apocalyptic number.

It is an amenable number.

987309 is a deficient number, since it is larger than the sum of its proper divisors (585171).

987309 is a wasteful number, since it uses less digits than its factorization.

987309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271 (or 259 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 987309 is about 993.6342385405. The cubic root of 987309 is about 99.5751643694.

It can be divided in two parts, 987 and 309, that added together give a 4-th power (1296 = 6⁴).

The spelling of 987309 in words is "nine hundred eighty-seven thousand, three hundred nine".