2240809 has 2 divisors, whose sum is σ = 2240810. Its totient is φ = 2240808.

The previous prime is 2240807. The next prime is 2240827. The reversal of 2240809 is 9080422.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2111209 + 129600 = 1453^2 + 360^2 .

It is a cyclic number.

It is not a de Polignac number, because 2240809 - 2¹ = 2240807 is a prime.

Together with 2240807, it forms a pair of twin primes.

2240809 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2240807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1120404 + 1120405.

It is an arithmetic number, because the mean of its divisors is an integer number (1120405).

2^2240809 is an apocalyptic number.

It is an amenable number.

2240809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2240809 is an equidigital number, since it uses as much as digits as its factorization.

2240809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 2240809 is about 1496.9331982423. The cubic root of 2240809 is about 130.8584022536.

It can be divided in two parts, 22 and 40809, that multiplied together give a palindrome (897798).

The spelling of 2240809 in words is "two million, two hundred forty thousand, eight hundred nine".