40442209 has 2 divisors, whose sum is σ = 40442210. Its totient is φ = 40442208.

The previous prime is 40442191. The next prime is 40442243. The reversal of 40442209 is 90224404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40259025 + 183184 = 6345^2 + 428^2 .

It is a cyclic number.

It is not a de Polignac number, because 40442209 - 2⁵ = 40442177 is a prime.

It is not a weakly prime, because it can be changed into another prime (40442009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20221104 + 20221105.

It is an arithmetic number, because the mean of its divisors is an integer number (20221105).

Almost surely, 2^40442209 is an apocalyptic number.

It is an amenable number.

40442209 is a deficient number, since it is larger than the sum of its proper divisors (1).

40442209 is an equidigital number, since it uses as much as digits as its factorization.

40442209 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 40442209 is about 6359.4189199958. The cubic root of 40442209 is about 343.2508513543.

The spelling of 40442209 in words is "forty million, four hundred forty-two thousand, two hundred nine".