987609 has 16 divisors (see below), whose sum is σ = 1520640. Its totient is φ = 558480.

The previous prime is 987607. The next prime is 987631. The reversal of 987609 is 906789.

987609 is nontrivially palindromic in base 6.

It is not a de Polignac number, because 987609 - 2¹ = 987607 is a prime.

It is an Ulam number.

987609 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2572 + ... + 2930.

It is an arithmetic number, because the mean of its divisors is an integer number (95040).

2⁹⁸⁷⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

987609 is a deficient number, since it is larger than the sum of its proper divisors (533031).

987609 is a wasteful number, since it uses less digits than its factorization.

987609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 987609 is about 993.7851880563. The cubic root of 987609 is about 99.5852488597.

It can be divided in two parts, 987 and 609, that added together give a triangular number (1596 = T₅₆).

The spelling of 987609 in words is "nine hundred eighty-seven thousand, six hundred nine".