40802840909 has 2 divisors, whose sum is σ = 40802840910. Its totient is φ = 40802840908.

The previous prime is 40802840899. The next prime is 40802840933. The reversal of 40802840909 is 90904820804.

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., 40802788009 + 52900 = 201997^2 + 230^2 .

It is a cyclic number.

It is not a de Polignac number, because 40802840909 - 2²⁴ = 40786063693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40802840909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40802840959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20401420454 + 20401420455.

It is an arithmetic number, because the mean of its divisors is an integer number (20401420455).

Almost surely, 2^40802840909 is an apocalyptic number.

It is an amenable number.

40802840909 is a deficient number, since it is larger than the sum of its proper divisors (1).

40802840909 is an equidigital number, since it uses as much as digits as its factorization.

40802840909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 44.

The spelling of 40802840909 in words is "forty billion, eight hundred two million, eight hundred forty thousand, nine hundred nine".