1138306665 has 32 divisors (see below), whose sum is σ = 1901235456. Its totient is φ = 580988160.

The previous prime is 1138306661. The next prime is 1138306679. The reversal of 1138306665 is 5666038311.

It is not a de Polignac number, because 1138306665 - 2² = 1138306661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1138306661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17044 + ... + 50666.

It is an arithmetic number, because the mean of its divisors is an integer number (59413608).

Almost surely, 2^1138306665 is an apocalyptic number.

1138306665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1138306665 is a deficient number, since it is larger than the sum of its proper divisors (762928791).

1138306665 is a wasteful number, since it uses less digits than its factorization.

1138306665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33729.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 1138306665 is about 33738.8005862686. The cubic root of 1138306665 is about 1044.1264389002.

The spelling of 1138306665 in words is "one billion, one hundred thirty-eight million, three hundred six thousand, six hundred sixty-five".