1938909913 has 16 divisors (see below), whose sum is σ = 2049417216. Its totient is φ = 1830747600.

The previous prime is 1938909901. The next prime is 1938909919. The reversal of 1938909913 is 3199098391.

It is a cyclic number.

It is not a de Polignac number, because 1938909913 - 2⁵ = 1938909881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1938909919) 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 15 ways as a sum of consecutive naturals, for example, 578320 + ... + 581662.

It is an arithmetic number, because the mean of its divisors is an integer number (128088576).

Almost surely, 2^1938909913 is an apocalyptic number.

It is an amenable number.

1938909913 is a deficient number, since it is larger than the sum of its proper divisors (110507303).

1938909913 is a wasteful number, since it uses less digits than its factorization.

1938909913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3684.

The product of its (nonzero) digits is 472392, while the sum is 52.

The square root of 1938909913 is about 44033.0547770649. The cubic root of 1938909913 is about 1246.9600611171.

The spelling of 1938909913 in words is "one billion, nine hundred thirty-eight million, nine hundred nine thousand, nine hundred thirteen".