1980543 has 4 divisors (see below), whose sum is σ = 2640728. Its totient is φ = 1320360.

The previous prime is 1980529. The next prime is 1980577. The reversal of 1980543 is 3450891.

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

It is not a de Polignac number, because 1980543 - 2⁹ = 1980031 is a prime.

It is a D-number.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1980543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980523) 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, 330088 + ... + 330093.

It is an arithmetic number, because the mean of its divisors is an integer number (660182).

2^1980543 is an apocalyptic number.

1980543 is a deficient number, since it is larger than the sum of its proper divisors (660185).

1980543 is an equidigital number, since it uses as much as digits as its factorization.

1980543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660184.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1980543 is about 1407.3176613686. The cubic root of 1980543 is about 125.5822014551.

The spelling of 1980543 in words is "one million, nine hundred eighty thousand, five hundred forty-three".