405555945 has 16 divisors (see below), whose sum is σ = 649987200. Its totient is φ = 215930624.

The previous prime is 405555907. The next prime is 405555971. The reversal of 405555945 is 549555504.

It is a cyclic number.

It is not a de Polignac number, because 405555945 - 2⁶ = 405555881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 405555897 and 405555906.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 13584 + ... + 31553.

It is an arithmetic number, because the mean of its divisors is an integer number (40624200).

Almost surely, 2^405555945 is an apocalyptic number.

It is an amenable number.

405555945 is a deficient number, since it is larger than the sum of its proper divisors (244431255).

405555945 is a wasteful number, since it uses less digits than its factorization.

405555945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45744.

The product of its (nonzero) digits is 450000, while the sum is 42.

The square root of 405555945 is about 20138.4196251841. The cubic root of 405555945 is about 740.2020053580.

The spelling of 405555945 in words is "four hundred five million, five hundred fifty-five thousand, nine hundred forty-five".