1863985 has 4 divisors (see below), whose sum is σ = 2236788. Its totient is φ = 1491184.

The previous prime is 1863971. The next prime is 1863997. The reversal of 1863985 is 5893681.

It is a happy number.

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 815409 + 1048576 = 903^2 + 1024^2 .

It is a cyclic number.

It is not a de Polignac number, because 1863985 - 2⁷ = 1863857 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian 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, 186394 + ... + 186403.

It is an arithmetic number, because the mean of its divisors is an integer number (559197).

2^1863985 is an apocalyptic number.

It is an amenable number.

1863985 is a deficient number, since it is larger than the sum of its proper divisors (372803).

1863985 is an equidigital number, since it uses as much as digits as its factorization.

1863985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372802.

The product of its digits is 51840, while the sum is 40.

The square root of 1863985 is about 1365.2783598959. The cubic root of 1863985 is about 123.0686597517.

The spelling of 1863985 in words is "one million, eight hundred sixty-three thousand, nine hundred eighty-five".