2656399 has 2 divisors, whose sum is σ = 2656400. Its totient is φ = 2656398.

The previous prime is 2656391. The next prime is 2656417. The reversal of 2656399 is 9936562.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2656399 - 2³ = 2656391 is a prime.

2656399 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2656391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1328199 + 1328200.

It is an arithmetic number, because the mean of its divisors is an integer number (1328200).

2^2656399 is an apocalyptic number.

2656399 is a deficient number, since it is larger than the sum of its proper divisors (1).

2656399 is an equidigital number, since it uses as much as digits as its factorization.

2656399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 40.

The square root of 2656399 is about 1629.8463117730. The cubic root of 2656399 is about 138.4940458891.

It can be divided in two parts, 26563 and 99, that added together give a palindrome (26662).

The spelling of 2656399 in words is "two million, six hundred fifty-six thousand, three hundred ninety-nine".