40044209 has 2 divisors, whose sum is σ = 40044210. Its totient is φ = 40044208.

The previous prime is 40044139. The next prime is 40044227. The reversal of 40044209 is 90244004.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40043584 + 625 = 6328^2 + 25^2 .

It is a cyclic number.

It is not a de Polignac number, because 40044209 - 2²⁴ = 23266993 is a prime.

It is equal to p_2436161 and since 40044209 and 2436161 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (40044409) 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, 20022104 + 20022105.

It is an arithmetic number, because the mean of its divisors is an integer number (20022105).

Almost surely, 2^40044209 is an apocalyptic number.

It is an amenable number.

40044209 is a deficient number, since it is larger than the sum of its proper divisors (1).

40044209 is an equidigital number, since it uses as much as digits as its factorization.

40044209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 40044209 is about 6328.0493834988. The cubic root of 40044209 is about 342.1211368243.

The spelling of 40044209 in words is "forty million, forty-four thousand, two hundred nine".