6987205387 has 4 divisors (see below), whose sum is σ = 6993931360. Its totient is φ = 6980479416.

The previous prime is 6987205367. The next prime is 6987205403. The reversal of 6987205387 is 7835027896.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6987205387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6987205307) 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, 3361428 + ... + 3363505.

It is an arithmetic number, because the mean of its divisors is an integer number (1748482840).

Almost surely, 2^6987205387 is an apocalyptic number.

6987205387 is a deficient number, since it is larger than the sum of its proper divisors (6725973).

6987205387 is a wasteful number, since it uses less digits than its factorization.

6987205387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6725972.

The product of its (nonzero) digits is 5080320, while the sum is 55.

The square root of 6987205387 is about 83589.5052443786. The cubic root of 6987205387 is about 1911.7649855682.

The spelling of 6987205387 in words is "six billion, nine hundred eighty-seven million, two hundred five thousand, three hundred eighty-seven".