6656406 has 8 divisors (see below), whose sum is σ = 13312824. Its totient is φ = 2218800.

The previous prime is 6656393. The next prime is 6656437. The reversal of 6656406 is 6046566.

It is a sphenic number, since it is the product of 3 distinct primes.

6656406 is an admirable number.

It is a Curzon number.

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 3 ways as a sum of consecutive naturals, for example, 554695 + ... + 554706.

It is an arithmetic number, because the mean of its divisors is an integer number (1664103).

Almost surely, 2^6656406 is an apocalyptic number.

6656406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6656406 is a wasteful number, since it uses less digits than its factorization.

6656406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109406.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 6656406 is about 2580.0011627904. The cubic root of 6656406 is about 188.1105996269.

The spelling of 6656406 in words is "six million, six hundred fifty-six thousand, four hundred six".