1938453773 has 2 divisors, whose sum is σ = 1938453774. Its totient is φ = 1938453772.

The previous prime is 1938453743. The next prime is 1938453779. The reversal of 1938453773 is 3773548391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1457177929 + 481275844 = 38173^2 + 21938^2 .

It is an emirp because it is prime and its reverse (3773548391) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1938453773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1938453779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969226886 + 969226887.

It is an arithmetic number, because the mean of its divisors is an integer number (969226887).

Almost surely, 2^1938453773 is an apocalyptic number.

It is an amenable number.

1938453773 is a deficient number, since it is larger than the sum of its proper divisors (1).

1938453773 is an equidigital number, since it uses as much as digits as its factorization.

1938453773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 50.

The square root of 1938453773 is about 44027.8749543968. The cubic root of 1938453773 is about 1246.8622685434.

The spelling of 1938453773 in words is "one billion, nine hundred thirty-eight million, four hundred fifty-three thousand, seven hundred seventy-three".