1338735665 has 16 divisors (see below), whose sum is σ = 1677879360. Its totient is φ = 1024372800.

The previous prime is 1338735637. The next prime is 1338735667. The reversal of 1338735665 is 5665378331.

It is a happy number.

It is not a de Polignac number, because 1338735665 - 2¹⁶ = 1338670129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1338735667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50411 + ... + 72240.

It is an arithmetic number, because the mean of its divisors is an integer number (104867460).

Almost surely, 2^1338735665 is an apocalyptic number.

It is an amenable number.

1338735665 is a deficient number, since it is larger than the sum of its proper divisors (339143695).

1338735665 is a wasteful number, since it uses less digits than its factorization.

1338735665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122752.

The product of its digits is 1360800, while the sum is 47.

The square root of 1338735665 is about 36588.7368598589. The cubic root of 1338735665 is about 1102.1269219966.

The spelling of 1338735665 in words is "one billion, three hundred thirty-eight million, seven hundred thirty-five thousand, six hundred sixty-five".