1993845449 has 2 divisors, whose sum is σ = 1993845450. Its totient is φ = 1993845448.

The previous prime is 1993845443. The next prime is 1993845463. The reversal of 1993845449 is 9445483991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1790982400 + 202863049 = 42320^2 + 14243^2 .

It is a cyclic number.

It is not a de Polignac number, because 1993845449 - 2¹⁶ = 1993779913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1993845394 and 1993845403.

It is not a weakly prime, because it can be changed into another prime (1993845443) 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, 996922724 + 996922725.

It is an arithmetic number, because the mean of its divisors is an integer number (996922725).

Almost surely, 2^1993845449 is an apocalyptic number.

It is an amenable number.

1993845449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1993845449 is an equidigital number, since it uses as much as digits as its factorization.

1993845449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5598720, while the sum is 56.

The square root of 1993845449 is about 44652.4965595430. The cubic root of 1993845449 is about 1258.6273472332.

The spelling of 1993845449 in words is "one billion, nine hundred ninety-three million, eight hundred forty-five thousand, four hundred forty-nine".