1938221395 has 32 divisors (see below), whose sum is σ = 2616655104. Its totient is φ = 1366185600.

The previous prime is 1938221393. The next prime is 1938221419. The reversal of 1938221395 is 5931228391.

It is not a de Polignac number, because 1938221395 - 2¹ = 1938221393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1938221393) 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 in 31 ways as a sum of consecutive naturals, for example, 237940 + ... + 245950.

It is an arithmetic number, because the mean of its divisors is an integer number (81770472).

Almost surely, 2^1938221395 is an apocalyptic number.

1938221395 is a deficient number, since it is larger than the sum of its proper divisors (678433709).

1938221395 is a wasteful number, since it uses less digits than its factorization.

1938221395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8163.

The product of its digits is 116640, while the sum is 43.

The square root of 1938221395 is about 44025.2358880677. The cubic root of 1938221395 is about 1246.8124427590.

The spelling of 1938221395 in words is "one billion, nine hundred thirty-eight million, two hundred twenty-one thousand, three hundred ninety-five".