405122660 has 24 divisors (see below), whose sum is σ = 860320440. Its totient is φ = 160227584.

The previous prime is 405122647. The next prime is 405122671. The reversal of 405122660 is 66221504.

It can be written as a sum of positive squares in 4 ways, for example, as 1032256 + 404090404 = 1016^2 + 20102^2 .

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 7 ways as a sum of consecutive naturals, for example, 112019 + ... + 115578.

It is an arithmetic number, because the mean of its divisors is an integer number (35846685).

Almost surely, 2^405122660 is an apocalyptic number.

It is an amenable number.

405122660 is an abundant number, since it is smaller than the sum of its proper divisors (455197780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

405122660 is a wasteful number, since it uses less digits than its factorization.

405122660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227695 (or 227693 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 405122660 is about 20127.6590789888. The cubic root of 405122660 is about 739.9383074939.

The spelling of 405122660 in words is "four hundred five million, one hundred twenty-two thousand, six hundred sixty".