40705809391385 has 8 divisors (see below), whose sum is σ = 48848494265736. Its totient is φ = 32563632182400.

The previous prime is 40705809391369. The next prime is 40705809391427. The reversal of 40705809391385 is 58319390850704.

40705809391385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 5683937578201 + 35021871813184 = 2384101^2 + 5917928^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40705809391385 - 2⁴ = 40705809391369 is a prime.

It is a super-2 number, since 2×40705809391385² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 126739916 + ... + 127060685.

It is an arithmetic number, because the mean of its divisors is an integer number (6106061783217).

Almost surely, 2^{40705809391385} is an apocalyptic number.

It is an amenable number.

40705809391385 is a deficient number, since it is larger than the sum of its proper divisors (8142684874351).

40705809391385 is a wasteful number, since it uses less digits than its factorization.

40705809391385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253832683.

The product of its (nonzero) digits is 32659200, while the sum is 62.

The spelling of 40705809391385 in words is "forty trillion, seven hundred five billion, eight hundred nine million, three hundred ninety-one thousand, three hundred eighty-five".