1001865 has 8 divisors (see below), whose sum is σ = 1603008. Its totient is φ = 534320.

The previous prime is 1001839. The next prime is 1001911. The reversal of 1001865 is 5681001.

1001865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1001865 - 2⁶ = 1001801 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33381 + ... + 33410.

It is an arithmetic number, because the mean of its divisors is an integer number (200376).

2^1001865 is an apocalyptic number.

1001865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1001865 is a deficient number, since it is larger than the sum of its proper divisors (601143).

1001865 is an equidigital number, since it uses as much as digits as its factorization.

1001865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66799.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 1001865 is about 1000.9320656268. The cubic root of 1001865 is about 100.0621280597.

Adding to 1001865 its reverse (5681001), we get a palindrome (6682866).

The spelling of 1001865 in words is "one million, one thousand, eight hundred sixty-five".