1543979 has 2 divisors, whose sum is σ = 1543980. Its totient is φ = 1543978.

The previous prime is 1543961. The next prime is 1543981. The reversal of 1543979 is 9793451.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (9793451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1543979 - 2¹² = 1539883 is a prime.

Together with 1543981, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1543909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771989 + 771990.

It is an arithmetic number, because the mean of its divisors is an integer number (771990).

2^1543979 is an apocalyptic number.

1543979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1543979 is an equidigital number, since it uses as much as digits as its factorization.

1543979 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1543979 is about 1242.5695151580. The cubic root of 1543979 is about 115.5794072984.

The spelling of 1543979 in words is "one million, five hundred forty-three thousand, nine hundred seventy-nine".