1918193 has 2 divisors, whose sum is σ = 1918194. Its totient is φ = 1918192.

The previous prime is 1918181. The next prime is 1918219. The reversal of 1918193 is 3918191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1183744 + 734449 = 1088^2 + 857^2 .

It is a cyclic number.

It is not a de Polignac number, because 1918193 - 2⁶ = 1918129 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1912193) 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, 959096 + 959097.

It is an arithmetic number, because the mean of its divisors is an integer number (959097).

2^1918193 is an apocalyptic number.

It is an amenable number.

1918193 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918193 is an equidigital number, since it uses as much as digits as its factorization.

1918193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 32.

The square root of 1918193 is about 1384.9884476052. The cubic root of 1918193 is about 124.2502965472.

Adding to 1918193 its sum of digits (32), we get a square (1918225 = 1385²).

The spelling of 1918193 in words is "one million, nine hundred eighteen thousand, one hundred ninety-three".