40017209 has 2 divisors, whose sum is σ = 40017210. Its totient is φ = 40017208.

The previous prime is 40017169. The next prime is 40017221. The reversal of 40017209 is 90271004.

40017209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31047184 + 8970025 = 5572^2 + 2995^2 .

It is a cyclic number.

It is not a de Polignac number, because 40017209 - 2⁸ = 40016953 is a prime.

It is a super-2 number, since 2×40017209² = 3202754032299362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40017409) 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, 20008604 + 20008605.

It is an arithmetic number, because the mean of its divisors is an integer number (20008605).

Almost surely, 2^40017209 is an apocalyptic number.

It is an amenable number.

40017209 is a deficient number, since it is larger than the sum of its proper divisors (1).

40017209 is an equidigital number, since it uses as much as digits as its factorization.

40017209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 40017209 is about 6325.9156649453. The cubic root of 40017209 is about 342.0442272637.

The spelling of 40017209 in words is "forty million, seventeen thousand, two hundred nine".