405684428 has 48 divisors (see below), whose sum is σ = 776613600. Its totient is φ = 184757760.

The previous prime is 405684421. The next prime is 405684443. The reversal of 405684428 is 824486504.

It is not an unprimeable number, because it can be changed into a prime (405684421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249458 + ... + 251078.

It is an arithmetic number, because the mean of its divisors is an integer number (16179450).

Almost surely, 2^405684428 is an apocalyptic number.

It is an amenable number.

405684428 is a deficient number, since it is larger than the sum of its proper divisors (370929172).

405684428 is a wasteful number, since it uses less digits than its factorization.

405684428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770 (or 1768 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 41.

The square root of 405684428 is about 20141.6093696606. The cubic root of 405684428 is about 740.2801641867.

The spelling of 405684428 in words is "four hundred five million, six hundred eighty-four thousand, four hundred twenty-eight".