1979843 has 4 divisors (see below), whose sum is σ = 1986600. Its totient is φ = 1973088.

The previous prime is 1979827. The next prime is 1979891. The reversal of 1979843 is 3489791.

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: 3489791 = 59 ⋅59149.

It is a cyclic number.

It is not a de Polignac number, because 1979843 - 2⁴ = 1979827 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 1979843.

It is not an unprimeable number, because it can be changed into a prime (1979893) 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, 2918 + ... + 3531.

It is an arithmetic number, because the mean of its divisors is an integer number (496650).

2^1979843 is an apocalyptic number.

1979843 is a deficient number, since it is larger than the sum of its proper divisors (6757).

1979843 is an equidigital number, since it uses as much as digits as its factorization.

1979843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6756.

The product of its digits is 54432, while the sum is 41.

The square root of 1979843 is about 1407.0689393203. The cubic root of 1979843 is about 125.5674045198.

The spelling of 1979843 in words is "one million, nine hundred seventy-nine thousand, eight hundred forty-three".