2663399 has 4 divisors (see below), whose sum is σ = 2666664. Its totient is φ = 2660136.

The previous prime is 2663393. The next prime is 2663429. The reversal of 2663399 is 9933662.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9933662 = 2 ⋅4966831.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2663399 is a prime.

It is a Duffinian 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 809 + ... + 2445.

It is an arithmetic number, because the mean of its divisors is an integer number (666666).

2^2663399 is an apocalyptic number.

2663399 is a deficient number, since it is larger than the sum of its proper divisors (3265).

2663399 is a wasteful number, since it uses less digits than its factorization.

2663399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3264.

The product of its digits is 52488, while the sum is 38.

The square root of 2663399 is about 1631.9923406683. The cubic root of 2663399 is about 138.6155898804.

The spelling of 2663399 in words is "two million, six hundred sixty-three thousand, three hundred ninety-nine".