405680556 has 24 divisors (see below), whose sum is σ = 948913840. Its totient is φ = 134894592.

The previous prime is 405680531. The next prime is 405680557. The reversal of 405680556 is 655086504.

It is not an unprimeable number, because it can be changed into a prime (405680557) 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 7 ways as a sum of consecutive naturals, for example, 36421 + ... + 46236.

Almost surely, 2^405680556 is an apocalyptic number.

It is an amenable number.

405680556 is an abundant number, since it is smaller than the sum of its proper divisors (543233284).

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

405680556 is a wasteful number, since it uses less digits than its factorization.

405680556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83073 (or 83071 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 39.

The square root of 405680556 is about 20141.5132500018. The cubic root of 405680556 is about 740.2778090113.

The spelling of 405680556 in words is "four hundred five million, six hundred eighty thousand, five hundred fifty-six".