40809387413 has 2 divisors, whose sum is σ = 40809387414. Its totient is φ = 40809387412.

The previous prime is 40809387407. The next prime is 40809387457. The reversal of 40809387413 is 31478390804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39779105809 + 1030281604 = 199447^2 + 32098^2 .

It is a cyclic number.

It is not a de Polignac number, because 40809387413 - 2⁴ = 40809387397 is a prime.

It is a super-2 number, since 2×40809387413² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40809387613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20404693706 + 20404693707.

It is an arithmetic number, because the mean of its divisors is an integer number (20404693707).

Almost surely, 2^40809387413 is an apocalyptic number.

It is an amenable number.

40809387413 is a deficient number, since it is larger than the sum of its proper divisors (1).

40809387413 is an equidigital number, since it uses as much as digits as its factorization.

40809387413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 580608, while the sum is 47.

The spelling of 40809387413 in words is "forty billion, eight hundred nine million, three hundred eighty-seven thousand, four hundred thirteen".