440340209 has 2 divisors, whose sum is σ = 440340210. Its totient is φ = 440340208.

The previous prime is 440340193. The next prime is 440340211. The reversal of 440340209 is 902043044.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 312582400 + 127757809 = 17680^2 + 11303^2 .

It is a cyclic number.

It is not a de Polignac number, because 440340209 - 2⁴ = 440340193 is a prime.

Together with 440340211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (440340809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220170104 + 220170105.

It is an arithmetic number, because the mean of its divisors is an integer number (220170105).

Almost surely, 2^440340209 is an apocalyptic number.

It is an amenable number.

440340209 is a deficient number, since it is larger than the sum of its proper divisors (1).

440340209 is an equidigital number, since it uses as much as digits as its factorization.

440340209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 440340209 is about 20984.2848103051. The cubic root of 440340209 is about 760.7864717494.

The spelling of 440340209 in words is "four hundred forty million, three hundred forty thousand, two hundred nine".