6987999 has 8 divisors (see below), whose sum is σ = 9544752. Its totient is φ = 4544960.

The previous prime is 6987983. The next prime is 6988039. The reversal of 6987999 is 9997896.

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

It is a cyclic number.

It is not a de Polignac number, because 6987999 - 2⁴ = 6987983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6987949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28284 + ... + 28529.

It is an arithmetic number, because the mean of its divisors is an integer number (1193094).

Almost surely, 2^6987999 is an apocalyptic number.

6987999 is a deficient number, since it is larger than the sum of its proper divisors (2556753).

6987999 is a wasteful number, since it uses less digits than its factorization.

6987999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56857.

The product of its digits is 2204496, while the sum is 57.

The square root of 6987999 is about 2643.4823623395. The cubic root of 6987999 is about 191.1837362817.

The spelling of 6987999 in words is "six million, nine hundred eighty-seven thousand, nine hundred ninety-nine".