6987439 has 4 divisors (see below), whose sum is σ = 7003656. Its totient is φ = 6971224.

The previous prime is 6987433. The next prime is 6987451. The reversal of 6987439 is 9347896.

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 6987439 - 2¹⁹ = 6463151 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6987433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7444 + ... + 8329.

It is an arithmetic number, because the mean of its divisors is an integer number (1750914).

Almost surely, 2^6987439 is an apocalyptic number.

6987439 is a deficient number, since it is larger than the sum of its proper divisors (16217).

6987439 is a wasteful number, since it uses less digits than its factorization.

6987439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16216.

The product of its digits is 326592, while the sum is 46.

The square root of 6987439 is about 2643.3764393291. The cubic root of 6987439 is about 191.1786291567.

The spelling of 6987439 in words is "six million, nine hundred eighty-seven thousand, four hundred thirty-nine".