2644399 has 2 divisors, whose sum is σ = 2644400. Its totient is φ = 2644398.

The previous prime is 2644387. The next prime is 2644403. The reversal of 2644399 is 9934462.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2644399 - 2¹¹ = 2642351 is a prime.

It is a d-powerful number, because it can be written as 2⁵ + 6 + 4 + 4¹⁰ + 3¹³ + 9³ + 9³ .

2644399 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2644339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1322199 + 1322200.

It is an arithmetic number, because the mean of its divisors is an integer number (1322200).

2^2644399 is an apocalyptic number.

2644399 is a deficient number, since it is larger than the sum of its proper divisors (1).

2644399 is an equidigital number, since it uses as much as digits as its factorization.

2644399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 37.

The square root of 2644399 is about 1626.1608161556. The cubic root of 2644399 is about 138.2851870319.

The spelling of 2644399 in words is "two million, six hundred forty-four thousand, three hundred ninety-nine".