40709209949 has 2 divisors, whose sum is σ = 40709209950. Its totient is φ = 40709209948.

The previous prime is 40709209939. The next prime is 40709209991. The reversal of 40709209949 is 94990290704.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35101896025 + 5607313924 = 187355^2 + 74882^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40709209949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40709209949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40709209909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20354604974 + 20354604975.

It is an arithmetic number, because the mean of its divisors is an integer number (20354604975).

Almost surely, 2^40709209949 is an apocalyptic number.

It is an amenable number.

40709209949 is a deficient number, since it is larger than the sum of its proper divisors (1).

40709209949 is an equidigital number, since it uses as much as digits as its factorization.

40709209949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1469664, while the sum is 53.

The spelling of 40709209949 in words is "forty billion, seven hundred nine million, two hundred nine thousand, nine hundred forty-nine".