1972643 has 2 divisors, whose sum is σ = 1972644. Its totient is φ = 1972642.

The previous prime is 1972627. The next prime is 1972651. The reversal of 1972643 is 3462791.

It is a strong prime.

It is an emirp because it is prime and its reverse (3462791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1972643 - 2⁴ = 1972627 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1972603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986321 + 986322.

It is an arithmetic number, because the mean of its divisors is an integer number (986322).

2^1972643 is an apocalyptic number.

1972643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1972643 is an equidigital number, since it uses as much as digits as its factorization.

1972643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 32.

The square root of 1972643 is about 1404.5080989443. The cubic root of 1972643 is about 125.4150046443.

The spelling of 1972643 in words is "one million, nine hundred seventy-two thousand, six hundred forty-three".