6405128 has 16 divisors (see below), whose sum is σ = 12642000. Its totient is φ = 3033936.

The previous prime is 6405101. The next prime is 6405131. The reversal of 6405128 is 8215046.

It is a junction number, because it is equal to n+sod(n) for n = 6405097 and 6405106.

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, 20918 + ... + 21221.

It is an arithmetic number, because the mean of its divisors is an integer number (790125).

Almost surely, 2^6405128 is an apocalyptic number.

It is an amenable number.

6405128 is a deficient number, since it is larger than the sum of its proper divisors (6236872).

6405128 is a wasteful number, since it uses less digits than its factorization.

6405128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42164 (or 42160 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 6405128 is about 2530.8354351874. The cubic root of 6405128 is about 185.7131277471.

It can be divided in two parts, 6405 and 128, that multiplied together give a triangular number (819840 = T₁₂₈₀).

The spelling of 6405128 in words is "six million, four hundred five thousand, one hundred twenty-eight".