2163985 has 4 divisors (see below), whose sum is σ = 2596788. Its totient is φ = 1731184.

The previous prime is 2163983. The next prime is 2164003. The reversal of 2163985 is 5893612.

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 762129 + 1401856 = 873^2 + 1184^2 .

It is a cyclic number.

It is not a de Polignac number, because 2163985 - 2¹ = 2163983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2163985.

It is not an unprimeable number, because it can be changed into a prime (2163983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216394 + ... + 216403.

It is an arithmetic number, because the mean of its divisors is an integer number (649197).

2^2163985 is an apocalyptic number.

It is an amenable number.

2163985 is a deficient number, since it is larger than the sum of its proper divisors (432803).

2163985 is an equidigital number, since it uses as much as digits as its factorization.

2163985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432802.

The product of its digits is 12960, while the sum is 34.

The square root of 2163985 is about 1471.0489454807. The cubic root of 2163985 is about 129.3455272156.

The spelling of 2163985 in words is "two million, one hundred sixty-three thousand, nine hundred eighty-five".