405540986041 has 3 divisors (see below), whose sum is σ = 405541622863. Its totient is φ = 405540349220.

The previous prime is 405540985981. The next prime is 405540986047. The reversal of 405540986041 is 140689045504.

It is a happy number.

The square root of 405540986041 is 636821.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 223945686441 + 181595299600 = 473229^2 + 426140^2 .

It is not a de Polignac number, because 405540986041 - 2³³ = 396951051449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 405540985982 and 405540986000.

It is not an unprimeable number, because it can be changed into a prime (405540986047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 318411 + ... + 955231.

Almost surely, 2^405540986041 is an apocalyptic number.

405540986041 is the 636821-st square number.

405540986041 is the 318411-st centered octagonal number.

It is an amenable number.

405540986041 is a deficient number, since it is larger than the sum of its proper divisors (636822).

405540986041 is an frugal number, since it uses more digits than its factorization.

405540986041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273642 (or 636821 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 46.

The spelling of 405540986041 in words is "four hundred five billion, five hundred forty million, nine hundred eighty-six thousand, forty-one".