40736209 has 4 divisors (see below), whose sum is σ = 42880240. Its totient is φ = 38592180.

The previous prime is 40736203. The next prime is 40736219. The reversal of 40736209 is 90263704.

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 40736209 - 2⁵ = 40736177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40736203) 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, 1071987 + ... + 1072024.

It is an arithmetic number, because the mean of its divisors is an integer number (10720060).

Almost surely, 2^40736209 is an apocalyptic number.

It is an amenable number.

40736209 is a deficient number, since it is larger than the sum of its proper divisors (2144031).

40736209 is a wasteful number, since it uses less digits than its factorization.

40736209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2144030.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 40736209 is about 6382.4923815074. The cubic root of 40736209 is about 344.0806130934.

The spelling of 40736209 in words is "forty million, seven hundred thirty-six thousand, two hundred nine".