1001985 has 16 divisors (see below), whose sum is σ = 1628736. Its totient is φ = 525888.

The previous prime is 1001983. The next prime is 1001989. The reversal of 1001985 is 5891001.

It is not a de Polignac number, because 1001985 - 2¹ = 1001983 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1001981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 507 + ... + 1503.

It is an arithmetic number, because the mean of its divisors is an integer number (101796).

2^1001985 is an apocalyptic number.

1001985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1001985 is a deficient number, since it is larger than the sum of its proper divisors (626751).

1001985 is an equidigital number, since it uses as much as digits as its factorization.

1001985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072.

The product of its (nonzero) digits is 360, while the sum is 24.

The square root of 1001985 is about 1000.9920079601. The cubic root of 1001985 is about 100.0661229346.

Adding to 1001985 its reverse (5891001), we get a palindrome (6892986).

The spelling of 1001985 in words is "one million, one thousand, nine hundred eighty-five".