40244209 has 2 divisors, whose sum is σ = 40244210. Its totient is φ = 40244208.

The previous prime is 40244207. The next prime is 40244249. The reversal of 40244209 is 90244204.

40244209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38626225 + 1617984 = 6215^2 + 1272^2 .

It is a cyclic number.

It is not a de Polignac number, because 40244209 - 2¹ = 40244207 is a prime.

Together with 40244207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40244207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20122104 + 20122105.

It is an arithmetic number, because the mean of its divisors is an integer number (20122105).

Almost surely, 2^40244209 is an apocalyptic number.

It is an amenable number.

40244209 is a deficient number, since it is larger than the sum of its proper divisors (1).

40244209 is an equidigital number, since it uses as much as digits as its factorization.

40244209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 40244209 is about 6343.8323590713. The cubic root of 40244209 is about 342.6897635965.

The spelling of 40244209 in words is "forty million, two hundred forty-four thousand, two hundred nine".