40399260709 has 2 divisors, whose sum is σ = 40399260710. Its totient is φ = 40399260708.

The previous prime is 40399260697. The next prime is 40399260749. The reversal of 40399260709 is 90706299304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40198245025 + 201015684 = 200495^2 + 14178^2 .

It is a cyclic number.

It is not a de Polignac number, because 40399260709 - 2²⁹ = 39862389797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40399260749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20199630354 + 20199630355.

It is an arithmetic number, because the mean of its divisors is an integer number (20199630355).

Almost surely, 2^40399260709 is an apocalyptic number.

It is an amenable number.

40399260709 is a deficient number, since it is larger than the sum of its proper divisors (1).

40399260709 is an equidigital number, since it uses as much as digits as its factorization.

40399260709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 734832, while the sum is 49.

The spelling of 40399260709 in words is "forty billion, three hundred ninety-nine million, two hundred sixty thousand, seven hundred nine".