6999216 has 80 divisors (see below), whose sum is σ = 21260544. Its totient is φ = 1942272.

The previous prime is 6999203. The next prime is 6999241. The reversal of 6999216 is 6129996.

It is a happy number.

It is a super-2 number, since 2×6999216² = 97978049229312, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12151 + ... + 12713.

Almost surely, 2^6999216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6999216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10630272).

6999216 is an abundant number, since it is smaller than the sum of its proper divisors (14261328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6999216 is a wasteful number, since it uses less digits than its factorization.

6999216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618 (or 612 counting only the distinct ones).

The product of its digits is 52488, while the sum is 42.

The square root of 6999216 is about 2645.6031448424. The cubic root of 6999216 is about 191.2859764009.

The spelling of 6999216 in words is "six million, nine hundred ninety-nine thousand, two hundred sixteen".