405550405 has 16 divisors (see below), whose sum is σ = 531281520. Its totient is φ = 295377408.

The previous prime is 405550403. The next prime is 405550417. The reversal of 405550405 is 504055504.

It can be written as a sum of positive squares in 8 ways, for example, as 454276 + 405096129 = 674^2 + 20127^2 .

It is a cyclic number.

It is not a de Polignac number, because 405550405 - 2¹ = 405550403 is a prime.

It is a super-2 number, since 2×405550405² = 328942261991328050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405550403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37990 + ... + 47479.

It is an arithmetic number, because the mean of its divisors is an integer number (33205095).

Almost surely, 2^405550405 is an apocalyptic number.

It is an amenable number.

405550405 is a deficient number, since it is larger than the sum of its proper divisors (125731115).

405550405 is a wasteful number, since it uses less digits than its factorization.

405550405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85560.

The product of its (nonzero) digits is 10000, while the sum is 28.

The square root of 405550405 is about 20138.2820766817. The cubic root of 405550405 is about 740.1986348918.

The spelling of 405550405 in words is "four hundred five million, five hundred fifty thousand, four hundred five".