40011209 has 8 divisors (see below), whose sum is σ = 46306560. Its totient is φ = 33860736.

The previous prime is 40011197. The next prime is 40011211. The reversal of 40011209 is 90211004.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40011209 - 2¹² = 40007113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40011299) 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 in 7 ways as a sum of consecutive naturals, for example, 35624 + ... + 36729.

It is an arithmetic number, because the mean of its divisors is an integer number (5788320).

Almost surely, 2^40011209 is an apocalyptic number.

It is an amenable number.

40011209 is a deficient number, since it is larger than the sum of its proper divisors (6295351).

40011209 is an equidigital number, since it uses as much as digits as its factorization.

40011209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72439.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 40011209 is about 6325.4414075225. The cubic root of 40011209 is about 342.0271315525.

The spelling of 40011209 in words is "forty million, eleven thousand, two hundred nine".