2668397 has 4 divisors (see below), whose sum is σ = 2689536. Its totient is φ = 2647260.

The previous prime is 2668363. The next prime is 2668399. The reversal of 2668397 is 7938662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2668397 - 2⁶ = 2668333 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2¹⁹ + 6³ + 6⁶ + 8⁷ + 3³ + 9 + 7² .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2668399) 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, 10379 + ... + 10632.

It is an arithmetic number, because the mean of its divisors is an integer number (672384).

2^2668397 is an apocalyptic number.

It is an amenable number.

2668397 is a deficient number, since it is larger than the sum of its proper divisors (21139).

2668397 is a wasteful number, since it uses less digits than its factorization.

2668397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21138.

The product of its digits is 108864, while the sum is 41.

The square root of 2668397 is about 1633.5228801581. The cubic root of 2668397 is about 138.7022420382.

The spelling of 2668397 in words is "two million, six hundred sixty-eight thousand, three hundred ninety-seven".