2688399 has 24 divisors (see below), whose sum is σ = 4484480. Its totient is φ = 1520208.

The previous prime is 2688391. The next prime is 2688419. The reversal of 2688399 is 9938862.

It is not a de Polignac number, because 2688399 - 2³ = 2688391 is a prime.

It is a d-powerful number, because it can be written as 2⁷ + 6² + 8³ + 8⁷ + 3¹² + 9² + 9⁵ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2688391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8604 + ... + 8910.

2^2688399 is an apocalyptic number.

2688399 is a deficient number, since it is larger than the sum of its proper divisors (1796081).

2688399 is a wasteful number, since it uses less digits than its factorization.

2688399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459 (or 456 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 2688399 is about 1639.6338005787. The cubic root of 2688399 is about 139.0479450912.

The spelling of 2688399 in words is "two million, six hundred eighty-eight thousand, three hundred ninety-nine".