1986489943 has 4 divisors (see below), whose sum is σ = 2013702208. Its totient is φ = 1959277680.

The previous prime is 1986489913. The next prime is 1986489959. The reversal of 1986489943 is 3499846891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1986489943 - 2¹³ = 1986481751 is a prime.

It is a super-2 number, since 2×1986489943² = 7892284587280286498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986489913) 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, 13606023 + ... + 13606168.

It is an arithmetic number, because the mean of its divisors is an integer number (503425552).

Almost surely, 2^1986489943 is an apocalyptic number.

1986489943 is a deficient number, since it is larger than the sum of its proper divisors (27212265).

1986489943 is an equidigital number, since it uses as much as digits as its factorization.

1986489943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27212264.

The product of its digits is 13436928, while the sum is 61.

The square root of 1986489943 is about 44570.0565738927. The cubic root of 1986489943 is about 1257.0777037570.

The spelling of 1986489943 in words is "one billion, nine hundred eighty-six million, four hundred eighty-nine thousand, nine hundred forty-three".