1628865 has 24 divisors (see below), whose sum is σ = 3227328. Its totient is φ = 744480.

The previous prime is 1628857. The next prime is 1628867. The reversal of 1628865 is 5688261.

It is a happy number.

It is not a de Polignac number, because 1628865 - 2³ = 1628857 is a prime.

It is a Curzon number.

1628865 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1628867) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2271 + ... + 2900.

It is an arithmetic number, because the mean of its divisors is an integer number (134472).

2^1628865 is an apocalyptic number.

1628865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1628865 is a deficient number, since it is larger than the sum of its proper divisors (1598463).

1628865 is a wasteful number, since it uses less digits than its factorization.

1628865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5189 (or 5186 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 1628865 is about 1276.2699557695. The cubic root of 1628865 is about 117.6598699039.

The spelling of 1628865 in words is "one million, six hundred twenty-eight thousand, eight hundred sixty-five".