1938918349 has 2 divisors, whose sum is σ = 1938918350. Its totient is φ = 1938918348.

The previous prime is 1938918347. The next prime is 1938918407. The reversal of 1938918349 is 9438198391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1937584324 + 1334025 = 44018^2 + 1155^2 .

It is a cyclic number.

It is not a de Polignac number, because 1938918349 - 2¹ = 1938918347 is a prime.

Together with 1938918347, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1938918349.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1938918341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969459174 + 969459175.

It is an arithmetic number, because the mean of its divisors is an integer number (969459175).

Almost surely, 2^1938918349 is an apocalyptic number.

It is an amenable number.

1938918349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1938918349 is an equidigital number, since it uses as much as digits as its factorization.

1938918349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 55.

The square root of 1938918349 is about 44033.1505686341. The cubic root of 1938918349 is about 1246.9618695799.

The spelling of 1938918349 in words is "one billion, nine hundred thirty-eight million, nine hundred eighteen thousand, three hundred forty-nine".