6646394 has 8 divisors (see below), whose sum is σ = 10313460. Its totient is φ = 3208576.

The previous prime is 6646373. The next prime is 6646399. The reversal of 6646394 is 4936466.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6027025 + 619369 = 2455^2 + 787^2 .

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

It is not an unprimeable number, because it can be changed into a prime (6646399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57239 + ... + 57354.

Almost surely, 2^6646394 is an apocalyptic number.

6646394 is a deficient number, since it is larger than the sum of its proper divisors (3667066).

6646394 is a wasteful number, since it uses less digits than its factorization.

6646394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114624.

The product of its digits is 93312, while the sum is 38.

The square root of 6646394 is about 2578.0601234261. The cubic root of 6646394 is about 188.0162389775.

The spelling of 6646394 in words is "six million, six hundred forty-six thousand, three hundred ninety-four".