2640443 has 8 divisors (see below), whose sum is σ = 2873136. Its totient is φ = 2412000.

The previous prime is 2640409. The next prime is 2640497. The reversal of 2640443 is 3440462.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2640443 - 2¹⁰ = 2639419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2640343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308 + ... + 2318.

It is an arithmetic number, because the mean of its divisors is an integer number (359142).

2^2640443 is an apocalyptic number.

2640443 is a deficient number, since it is larger than the sum of its proper divisors (232693).

2640443 is a wasteful number, since it uses less digits than its factorization.

2640443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2125.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 2640443 is about 1624.9439990350. The cubic root of 2640443 is about 138.2161947676.

The spelling of 2640443 in words is "two million, six hundred forty thousand, four hundred forty-three".