1986863 has 4 divisors (see below), whose sum is σ = 2040600. Its totient is φ = 1933128.

The previous prime is 1986839. The next prime is 1986869. The reversal of 1986863 is 3686891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3686891 = 13 ⋅283607.

It is a cyclic number.

It is not a de Polignac number, because 1986863 - 2¹⁶ = 1921327 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 1986863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986869) 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, 26813 + ... + 26886.

It is an arithmetic number, because the mean of its divisors is an integer number (510150).

2^1986863 is an apocalyptic number.

1986863 is a deficient number, since it is larger than the sum of its proper divisors (53737).

1986863 is an equidigital number, since it uses as much as digits as its factorization.

1986863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53736.

The product of its digits is 62208, while the sum is 41.

The square root of 1986863 is about 1409.5612792639. The cubic root of 1986863 is about 125.7156390670.

The spelling of 1986863 in words is "one million, nine hundred eighty-six thousand, eight hundred sixty-three".