6999999 has 16 divisors (see below), whose sum is σ = 9886080. Its totient is φ = 4393440.

The previous prime is 6999997. The next prime is 7000003. The reversal of 6999999 is 9999996.

It is not a de Polignac number, because 6999999 - 2¹ = 6999997 is a prime.

6999999 is a modest number, since divided by 9999 gives 699 as remainder.

6999999 is a lucky number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6999997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12669 + ... + 13209.

It is an arithmetic number, because the mean of its divisors is an integer number (617880).

Almost surely, 2^6999999 is an apocalyptic number.

6999999 is a deficient number, since it is larger than the sum of its proper divisors (2886081).

6999999 is a wasteful number, since it uses less digits than its factorization.

6999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790.

The product of its digits is 3188646, while the sum is 60.

The square root of 6999999 is about 2645.7511220823. The cubic root of 6999999 is about 191.2931091680.

The spelling of 6999999 in words is "six million, nine hundred ninety-nine thousand, nine hundred ninety-nine".