405628 has 12 divisors (see below), whose sum is σ = 740880. Its totient is φ = 193952.

The previous prime is 405611. The next prime is 405641. The reversal of 405628 is 826504.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2113 + ... + 2296.

It is an arithmetic number, because the mean of its divisors is an integer number (61740).

2⁴⁰⁵⁶²⁸ is an apocalyptic number.

It is an amenable number.

405628 is a deficient number, since it is larger than the sum of its proper divisors (335252).

405628 is a wasteful number, since it uses less digits than its factorization.

405628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4436 (or 4434 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 405628 is about 636.8893153445. The cubic root of 405628 is about 74.0245839916.

The spelling of 405628 in words is "four hundred five thousand, six hundred twenty-eight".