1648865 has 4 divisors (see below), whose sum is σ = 1978644. Its totient is φ = 1319088.

The previous prime is 1648837. The next prime is 1648879. The reversal of 1648865 is 5688461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1227664 + 421201 = 1108^2 + 649^2 .

It is a cyclic number.

It is not a de Polignac number, because 1648865 - 2¹⁴ = 1632481 is a prime.

It is a Duffinian number.

It is a Curzon 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, 164882 + ... + 164891.

It is an arithmetic number, because the mean of its divisors is an integer number (494661).

2^1648865 is an apocalyptic number.

It is an amenable number.

1648865 is a deficient number, since it is larger than the sum of its proper divisors (329779).

1648865 is an equidigital number, since it uses as much as digits as its factorization.

1648865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329778.

The product of its digits is 46080, while the sum is 38.

The square root of 1648865 is about 1284.0813837137. The cubic root of 1648865 is about 118.1394740716.

The spelling of 1648865 in words is "one million, six hundred forty-eight thousand, eight hundred sixty-five".