6687406 has 16 divisors (see below), whose sum is σ = 10983600. Its totient is φ = 3028480.

The previous prime is 6687391. The next prime is 6687427. The reversal of 6687406 is 6047866.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 9540 + ... + 10216.

It is an arithmetic number, because the mean of its divisors is an integer number (686475).

Almost surely, 2^6687406 is an apocalyptic number.

6687406 is a deficient number, since it is larger than the sum of its proper divisors (4296194).

6687406 is a wasteful number, since it uses less digits than its factorization.

6687406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 6687406 is about 2586.0019334873. The cubic root of 6687406 is about 188.4021683449.

It can be divided in two parts, 668740 and 6, that added together give a triangular number (668746 = T₁₁₅₆).

The spelling of 6687406 in words is "six million, six hundred eighty-seven thousand, four hundred six".