1938475865 has 8 divisors (see below), whose sum is σ = 2326408128. Its totient is φ = 1550622640.

The previous prime is 1938475853. The next prime is 1938475871. The reversal of 1938475865 is 5685748391.

1938475865 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1938475865 - 2²² = 1934281561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1938475865.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 79964 + ... + 101346.

It is an arithmetic number, because the mean of its divisors is an integer number (290801016).

Almost surely, 2^1938475865 is an apocalyptic number.

It is an amenable number.

1938475865 is a deficient number, since it is larger than the sum of its proper divisors (387932263).

1938475865 is a wasteful number, since it uses less digits than its factorization.

1938475865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39519.

The product of its digits is 7257600, while the sum is 56.

The square root of 1938475865 is about 44028.1258401945. The cubic root of 1938475865 is about 1246.8670052356.

The spelling of 1938475865 in words is "one billion, nine hundred thirty-eight million, four hundred seventy-five thousand, eight hundred sixty-five".