6690393 has 6 divisors (see below), whose sum is σ = 9663914. Its totient is φ = 4460256.

The previous prime is 6690379. The next prime is 6690427. The reversal of 6690393 is 3930966.

It can be written as a sum of positive squares in only one way, i.e., 5745609 + 944784 = 2397^2 + 972^2 .

It is not a de Polignac number, because 6690393 - 2⁵ = 6690361 is a prime.

It is a super-2 number, since 2×6690393² = 89522716988898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6690323) 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 5 ways as a sum of consecutive naturals, for example, 371680 + ... + 371697.

Almost surely, 2^6690393 is an apocalyptic number.

It is an amenable number.

6690393 is a deficient number, since it is larger than the sum of its proper divisors (2973521).

6690393 is a wasteful number, since it uses less digits than its factorization.

6690393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743383 (or 743380 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 36.

The square root of 6690393 is about 2586.5794014489. The cubic root of 6690393 is about 188.4302147708.

The spelling of 6690393 in words is "six million, six hundred ninety thousand, three hundred ninety-three".