6645394 has 8 divisors (see below), whose sum is σ = 11392128. Its totient is φ = 2848020.

The previous prime is 6645391. The next prime is 6645461. The reversal of 6645394 is 4935466.

It is a happy number.

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

It is a super-2 number, since 2×6645394² = 88322522830472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6645391) by changing a digit.

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, 237322 + ... + 237349.

It is an arithmetic number, because the mean of its divisors is an integer number (1424016).

Almost surely, 2^6645394 is an apocalyptic number.

6645394 is a deficient number, since it is larger than the sum of its proper divisors (4746734).

6645394 is a wasteful number, since it uses less digits than its factorization.

6645394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474680.

The product of its digits is 77760, while the sum is 37.

The square root of 6645394 is about 2577.8661718561. The cubic root of 6645394 is about 188.0068090185.

The spelling of 6645394 in words is "six million, six hundred forty-five thousand, three hundred ninety-four".