6690406 has 8 divisors (see below), whose sum is σ = 10057680. Its totient is φ = 3337848.

The previous prime is 6690379. The next prime is 6690427. The reversal of 6690406 is 6040966.

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

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, 2461 + ... + 4408.

It is an arithmetic number, because the mean of its divisors is an integer number (1257210).

Almost surely, 2^6690406 is an apocalyptic number.

6690406 is a deficient number, since it is larger than the sum of its proper divisors (3367274).

6690406 is a wasteful number, since it uses less digits than its factorization.

6690406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7358.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 6690406 is about 2586.5819144191. The cubic root of 6690406 is about 188.4303368160.

The spelling of 6690406 in words is "six million, six hundred ninety thousand, four hundred six".