6999644 has 6 divisors (see below), whose sum is σ = 12249384. Its totient is φ = 3499820.

The previous prime is 6999611. The next prime is 6999647. The reversal of 6999644 is 4469996.

It is a super-2 number, since 2×6999644² = 97990032253472, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6999647) 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 as a sum of consecutive naturals, namely, 874952 + ... + 874959.

It is an arithmetic number, because the mean of its divisors is an integer number (2041564).

Almost surely, 2^6999644 is an apocalyptic number.

It is an amenable number.

6999644 is a deficient number, since it is larger than the sum of its proper divisors (5249740).

6999644 is a wasteful number, since it uses less digits than its factorization.

6999644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1749915 (or 1749913 counting only the distinct ones).

The product of its digits is 419904, while the sum is 47.

The square root of 6999644 is about 2645.6840325330. The cubic root of 6999644 is about 191.2898753484.

The spelling of 6999644 in words is "six million, nine hundred ninety-nine thousand, six hundred forty-four".