987389 has 8 divisors (see below), whose sum is σ = 1072512. Its totient is φ = 903600.

The previous prime is 987383. The next prime is 987391. The reversal of 987389 is 983789.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-987389 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

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 987389.

It is not an unprimeable number, because it can be changed into a prime (987383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1712 + ... + 2214.

It is an arithmetic number, because the mean of its divisors is an integer number (134064).

2⁹⁸⁷³⁸⁹ is an apocalyptic number.

It is an amenable number.

987389 is a deficient number, since it is larger than the sum of its proper divisors (85123).

987389 is a wasteful number, since it uses less digits than its factorization.

987389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667.

The product of its digits is 108864, while the sum is 44.

The square root of 987389 is about 993.6744939868. The cubic root of 987389 is about 99.5778537666.

Subtracting from 987389 its reverse (983789), we obtain a square (3600 = 60²).

The spelling of 987389 in words is "nine hundred eighty-seven thousand, three hundred eighty-nine".