6899864 has 8 divisors (see below), whose sum is σ = 12937260. Its totient is φ = 3449928.

The previous prime is 6899863. The next prime is 6899891. The reversal of 6899864 is 4689986.

It is a tau number, because it is divible by the number of its divisors (8).

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6899863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431234 + ... + 431249.

Almost surely, 2^6899864 is an apocalyptic number.

It is an amenable number.

6899864 is a deficient number, since it is larger than the sum of its proper divisors (6037396).

6899864 is a wasteful number, since it uses less digits than its factorization.

6899864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862489 (or 862485 counting only the distinct ones).

The product of its digits is 746496, while the sum is 50.

The square root of 6899864 is about 2626.7592200276. The cubic root of 6899864 is about 190.3765753966.

The spelling of 6899864 in words is "six million, eight hundred ninety-nine thousand, eight hundred sixty-four".