2644259 has 4 divisors (see below), whose sum is σ = 2647680. Its totient is φ = 2640840.

The previous prime is 2644247. The next prime is 2644261. The reversal of 2644259 is 9524462.

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: 9524462 = 2 ⋅4762231.

It is a cyclic number.

It is not a de Polignac number, because 2644259 - 2⁸ = 2644003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2644219) 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, 62 + ... + 2300.

It is an arithmetic number, because the mean of its divisors is an integer number (661920).

2^2644259 is an apocalyptic number.

2644259 is a deficient number, since it is larger than the sum of its proper divisors (3421).

2644259 is a wasteful number, since it uses less digits than its factorization.

2644259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3420.

The product of its digits is 17280, while the sum is 32.

The square root of 2644259 is about 1626.1177694128. The cubic root of 2644259 is about 138.2827466200.

The spelling of 2644259 in words is "two million, six hundred forty-four thousand, two hundred fifty-nine".