1938243784 has 8 divisors (see below), whose sum is σ = 3634207110. Its totient is φ = 969121888.

The previous prime is 1938243767. The next prime is 1938243793. The reversal of 1938243784 is 4873428391.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1707507684 + 230736100 = 41322^2 + 15190^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121140229 + ... + 121140244.

Almost surely, 2^1938243784 is an apocalyptic number.

It is an amenable number.

1938243784 is a deficient number, since it is larger than the sum of its proper divisors (1695963326).

1938243784 is a wasteful number, since it uses less digits than its factorization.

1938243784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242280479 (or 242280475 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 49.

The square root of 1938243784 is about 44025.4901619505. The cubic root of 1938243784 is about 1246.8172435137.

The spelling of 1938243784 in words is "one billion, nine hundred thirty-eight million, two hundred forty-three thousand, seven hundred eighty-four".