405660481 has 4 divisors (see below), whose sum is σ = 406703700. Its totient is φ = 404617264.

The previous prime is 405660457. The next prime is 405660491. The reversal of 405660481 is 184066504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 180660481 + 225000000 = 13441^2 + 15000^2 .

It is a cyclic number.

It is not a de Polignac number, because 405660481 - 2²³ = 397271873 is a prime.

It is a super-2 number, since 2×405660481² = 329120851690302722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405660401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 521026 + ... + 521803.

It is an arithmetic number, because the mean of its divisors is an integer number (101675925).

Almost surely, 2^405660481 is an apocalyptic number.

It is an amenable number.

405660481 is a deficient number, since it is larger than the sum of its proper divisors (1043219).

405660481 is a wasteful number, since it uses less digits than its factorization.

405660481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043218.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 405660481 is about 20141.0148949848. The cubic root of 405660481 is about 740.2655979896.

The spelling of 405660481 in words is "four hundred five million, six hundred sixty thousand, four hundred eighty-one".