1979543 has 2 divisors, whose sum is σ = 1979544. Its totient is φ = 1979542.

The previous prime is 1979539. The next prime is 1979563. The reversal of 1979543 is 3459791.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (3459791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1979543 - 2² = 1979539 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1979497 and 1979506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1979563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989771 + 989772.

It is an arithmetic number, because the mean of its divisors is an integer number (989772).

2^1979543 is an apocalyptic number.

1979543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1979543 is an equidigital number, since it uses as much as digits as its factorization.

1979543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34020, while the sum is 38.

The square root of 1979543 is about 1406.9623306969. The cubic root of 1979543 is about 125.5610619085.

The spelling of 1979543 in words is "one million, nine hundred seventy-nine thousand, five hundred forty-three".