1138899771 has 20 divisors (see below), whose sum is σ = 1702734264. Its totient is φ = 758635200.

The previous prime is 1138899757. The next prime is 1138899779. The reversal of 1138899771 is 1779988311.

It is not a de Polignac number, because 1138899771 - 2⁵ = 1138899739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1138899779) 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 19 ways as a sum of consecutive naturals, for example, 105076 + ... + 115406.

Almost surely, 2^1138899771 is an apocalyptic number.

1138899771 is a deficient number, since it is larger than the sum of its proper divisors (563834493).

1138899771 is a wasteful number, since it uses less digits than its factorization.

1138899771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11704 (or 11695 counting only the distinct ones).

The product of its digits is 762048, while the sum is 54.

The square root of 1138899771 is about 33747.5891138908. The cubic root of 1138899771 is about 1044.3077521172.

The spelling of 1138899771 in words is "one billion, one hundred thirty-eight million, eight hundred ninety-nine thousand, seven hundred seventy-one".