40331209 has 2 divisors, whose sum is σ = 40331210. Its totient is φ = 40331208.

The previous prime is 40331201. The next prime is 40331227. The reversal of 40331209 is 90213304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33674809 + 6656400 = 5803^2 + 2580^2 .

It is a cyclic number.

It is not a de Polignac number, because 40331209 - 2³ = 40331201 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40331209.

It is not a weakly prime, because it can be changed into another prime (40331201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20165604 + 20165605.

It is an arithmetic number, because the mean of its divisors is an integer number (20165605).

Almost surely, 2^40331209 is an apocalyptic number.

It is an amenable number.

40331209 is a deficient number, since it is larger than the sum of its proper divisors (1).

40331209 is an equidigital number, since it uses as much as digits as its factorization.

40331209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 40331209 is about 6350.6857110079. The cubic root of 40331209 is about 342.9365283025.

The spelling of 40331209 in words is "forty million, three hundred thirty-one thousand, two hundred nine".