40036209 has 4 divisors (see below), whose sum is σ = 53381616. Its totient is φ = 26690804.

The previous prime is 40036189. The next prime is 40036247. The reversal of 40036209 is 90263004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40036209 - 2⁷ = 40036081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40036289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6672699 + ... + 6672704.

It is an arithmetic number, because the mean of its divisors is an integer number (13345404).

Almost surely, 2^40036209 is an apocalyptic number.

It is an amenable number.

40036209 is a deficient number, since it is larger than the sum of its proper divisors (13345407).

40036209 is a wasteful number, since it uses less digits than its factorization.

40036209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13345406.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 40036209 is about 6327.4172456066. The cubic root of 40036209 is about 342.0983524114.

The spelling of 40036209 in words is "forty million, thirty-six thousand, two hundred nine".