987439 has 4 divisors (see below), whose sum is σ = 989560. Its totient is φ = 985320.

The previous prime is 987433. The next prime is 987457. The reversal of 987439 is 934789.

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

It is a cyclic number.

It is not a de Polignac number, because 987439 - 2⁹ = 986927 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 (987433) 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 3 ways as a sum of consecutive naturals, for example, 24 + ... + 1405.

It is an arithmetic number, because the mean of its divisors is an integer number (247390).

2⁹⁸⁷⁴³⁹ is an apocalyptic number.

987439 is a deficient number, since it is larger than the sum of its proper divisors (2121).

987439 is a wasteful number, since it uses less digits than its factorization.

987439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120.

The product of its digits is 54432, while the sum is 40.

The square root of 987439 is about 993.6996528127. The cubic root of 987439 is about 99.5795345660.

Subtracting from 987439 its reverse (934789), we obtain a triangular number (52650 = T₃₂₄).

The spelling of 987439 in words is "nine hundred eighty-seven thousand, four hundred thirty-nine".