6630397 has 4 divisors (see below), whose sum is σ = 6792156. Its totient is φ = 6468640.

The previous prime is 6630367. The next prime is 6630409. The reversal of 6630397 is 7930366.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2493241 + 4137156 = 1579^2 + 2034^2 .

It is a cyclic number.

It is not a de Polignac number, because 6630397 - 2⁷ = 6630269 is a prime.

It is a Duffinian number.

6630397 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6630367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80818 + ... + 80899.

It is an arithmetic number, because the mean of its divisors is an integer number (1698039).

Almost surely, 2^6630397 is an apocalyptic number.

It is an amenable number.

6630397 is a deficient number, since it is larger than the sum of its proper divisors (161759).

6630397 is a wasteful number, since it uses less digits than its factorization.

6630397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161758.

The product of its (nonzero) digits is 20412, while the sum is 34.

The square root of 6630397 is about 2574.9557277748. The cubic root of 6630397 is about 187.8652743066.

The spelling of 6630397 in words is "six million, six hundred thirty thousand, three hundred ninety-seven".