1938556099 has 16 divisors (see below), whose sum is σ = 1992586752. Its totient is φ = 1885439808.

The previous prime is 1938556079. The next prime is 1938556117. The reversal of 1938556099 is 9906558391.

It is a cyclic number.

It is not a de Polignac number, because 1938556099 - 2⁹ = 1938555587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1938556049) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 2608722 + ... + 2609464.

It is an arithmetic number, because the mean of its divisors is an integer number (124536672).

Almost surely, 2^1938556099 is an apocalyptic number.

1938556099 is a deficient number, since it is larger than the sum of its proper divisors (54030653).

1938556099 is a wasteful number, since it uses less digits than its factorization.

1938556099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266.

The product of its (nonzero) digits is 2624400, while the sum is 55.

The square root of 1938556099 is about 44029.0369983265. The cubic root of 1938556099 is about 1246.8842077104.

The spelling of 1938556099 in words is "one billion, nine hundred thirty-eight million, five hundred fifty-six thousand, ninety-nine".