6999667 has 4 divisors (see below), whose sum is σ = 7005240. Its totient is φ = 6994096.

The previous prime is 6999661. The next prime is 6999673. The reversal of 6999667 is 7669996.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (6999661) and next prime (6999673).

It is a cyclic number.

It is not a de Polignac number, because 6999667 - 2⁷ = 6999539 is a prime.

It is a super-2 number, since 2×6999667² = 97990676221778, which contains 22 as substring.

It is a Duffinian number.

6999667 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6999661) 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, 84 + ... + 3742.

It is an arithmetic number, because the mean of its divisors is an integer number (1751310).

Almost surely, 2^6999667 is an apocalyptic number.

6999667 is a deficient number, since it is larger than the sum of its proper divisors (5573).

6999667 is a wasteful number, since it uses less digits than its factorization.

6999667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5572.

The product of its digits is 1102248, while the sum is 52.

The square root of 6999667 is about 2645.6883792314. The cubic root of 6999667 is about 191.2900848668.

The spelling of 6999667 in words is "six million, nine hundred ninety-nine thousand, six hundred sixty-seven".