2665403 has 4 divisors (see below), whose sum is σ = 2870448. Its totient is φ = 2460360.

The previous prime is 2665391. The next prime is 2665409. The reversal of 2665403 is 3045662.

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

It is a cyclic number.

It is not a de Polignac number, because 2665403 - 2⁴ = 2665387 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

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 3 ways as a sum of consecutive naturals, for example, 102503 + ... + 102528.

It is an arithmetic number, because the mean of its divisors is an integer number (717612).

2^2665403 is an apocalyptic number.

2665403 is a deficient number, since it is larger than the sum of its proper divisors (205045).

2665403 is a wasteful number, since it uses less digits than its factorization.

2665403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205044.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 2665403 is about 1632.6061986897. The cubic root of 2665403 is about 138.6503469710.

The spelling of 2665403 in words is "two million, six hundred sixty-five thousand, four hundred three".