1938331999 has 4 divisors (see below), whose sum is σ = 1944084064. Its totient is φ = 1932579936.

The previous prime is 1938331981. The next prime is 1938332041. The reversal of 1938331999 is 9991338391.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1938331999 - 2⁹ = 1938331487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1938331939) 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 3 ways as a sum of consecutive naturals, for example, 2875527 + ... + 2876200.

It is an arithmetic number, because the mean of its divisors is an integer number (486021016).

Almost surely, 2^1938331999 is an apocalyptic number.

1938331999 is a deficient number, since it is larger than the sum of its proper divisors (5752065).

1938331999 is an equidigital number, since it uses as much as digits as its factorization.

1938331999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5752064.

The product of its digits is 1417176, while the sum is 55.

The square root of 1938331999 is about 44026.4920133322. The cubic root of 1938331999 is about 1246.8361586291.

The spelling of 1938331999 in words is "one billion, nine hundred thirty-eight million, three hundred thirty-one thousand, nine hundred ninety-nine".