2665406 has 16 divisors (see below), whose sum is σ = 4149600. Its totient is φ = 1283040.

The previous prime is 2665391. The next prime is 2665409. The reversal of 2665406 is 6045662.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665409) 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 7 ways as a sum of consecutive naturals, for example, 13295 + ... + 13493.

It is an arithmetic number, because the mean of its divisors is an integer number (259350).

2^2665406 is an apocalyptic number.

2665406 is a deficient number, since it is larger than the sum of its proper divisors (1484194).

2665406 is a wasteful number, since it uses less digits than its factorization.

2665406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 2665406 is about 1632.6071174658. The cubic root of 2665406 is about 138.6503989895.

The spelling of 2665406 in words is "two million, six hundred sixty-five thousand, four hundred six".