6681406 has 4 divisors (see below), whose sum is σ = 10022112. Its totient is φ = 3340702.

The previous prime is 6681403. The next prime is 6681419. The reversal of 6681406 is 6041866.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×6681406² = 89282372273672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6681403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1670350 + ... + 1670353.

It is an arithmetic number, because the mean of its divisors is an integer number (2505528).

Almost surely, 2^6681406 is an apocalyptic number.

6681406 is a deficient number, since it is larger than the sum of its proper divisors (3340706).

6681406 is a wasteful number, since it uses less digits than its factorization.

6681406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3340705.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 6681406 is about 2584.8415812192. The cubic root of 6681406 is about 188.3458061196.

The spelling of 6681406 in words is "six million, six hundred eighty-one thousand, four hundred six".