1985212793 has 2 divisors, whose sum is σ = 1985212794. Its totient is φ = 1985212792.

The previous prime is 1985212787. The next prime is 1985212847. The reversal of 1985212793 is 3972125891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1689785449 + 295427344 = 41107^2 + 17188^2 .

It is an emirp because it is prime and its reverse (3972125891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1985212793 - 2¹⁶ = 1985147257 is a prime.

It is not a weakly prime, because it can be changed into another prime (1985212703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992606396 + 992606397.

It is an arithmetic number, because the mean of its divisors is an integer number (992606397).

Almost surely, 2^1985212793 is an apocalyptic number.

It is an amenable number.

1985212793 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985212793 is an equidigital number, since it uses as much as digits as its factorization.

1985212793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 47.

The square root of 1985212793 is about 44555.7268260770. The cubic root of 1985212793 is about 1256.8082467379.

The spelling of 1985212793 in words is "one billion, nine hundred eighty-five million, two hundred twelve thousand, seven hundred ninety-three".