2663391 has 8 divisors (see below), whose sum is σ = 3567744. Its totient is φ = 1767320.

The previous prime is 2663359. The next prime is 2663393. The reversal of 2663391 is 1933662.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2663391 - 2⁵ = 2663359 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2663393) 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, 1275 + ... + 2636.

It is an arithmetic number, because the mean of its divisors is an integer number (445968).

2^2663391 is an apocalyptic number.

2663391 is a deficient number, since it is larger than the sum of its proper divisors (904353).

2663391 is a wasteful number, since it uses less digits than its factorization.

2663391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4141.

The product of its digits is 5832, while the sum is 30.

The square root of 2663391 is about 1631.9898896746. The cubic root of 2663391 is about 138.6154510946.

The spelling of 2663391 in words is "two million, six hundred sixty-three thousand, three hundred ninety-one".