405128 has 16 divisors (see below), whose sum is σ = 769500. Its totient is φ = 199936.

The previous prime is 405091. The next prime is 405143. The reversal of 405128 is 821504.

It can be written as a sum of positive squares in 2 ways, for example, as 357604 + 47524 = 598^2 + 218^2 .

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, 428 + ... + 996.

2⁴⁰⁵¹²⁸ is an apocalyptic number.

It is an amenable number.

405128 is a deficient number, since it is larger than the sum of its proper divisors (364372).

405128 is a wasteful number, since it uses less digits than its factorization.

405128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 405128 is about 636.4966614209. The cubic root of 405128 is about 73.9941558570.

It can be divided in two parts, 40 and 5128, that multiplied together give a triangular number (205120 = T₆₄₀).

The spelling of 405128 in words is "four hundred five thousand, one hundred twenty-eight".