6999387 has 4 divisors (see below), whose sum is σ = 9332520. Its totient is φ = 4666256.

The previous prime is 6999379. The next prime is 6999389. The reversal of 6999387 is 7839996.

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 6999387 - 2³ = 6999379 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (6999389) 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, 1166562 + ... + 1166567.

It is an arithmetic number, because the mean of its divisors is an integer number (2333130).

Almost surely, 2^6999387 is an apocalyptic number.

6999387 is a deficient number, since it is larger than the sum of its proper divisors (2333133).

6999387 is a wasteful number, since it uses less digits than its factorization.

6999387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2333132.

The product of its digits is 734832, while the sum is 51.

The square root of 6999387 is about 2645.6354624173. The cubic root of 6999387 is about 191.2875341770.

The spelling of 6999387 in words is "six million, nine hundred ninety-nine thousand, three hundred eighty-seven".