13138665 has 16 divisors (see below), whose sum is σ = 21067776. Its totient is φ = 6992000.

The previous prime is 13138639. The next prime is 13138673. The reversal of 13138665 is 56683131.

It is not a de Polignac number, because 13138665 - 2¹³ = 13130473 is a prime.

It is a Curzon number.

It is an unprimeable number.

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, 10840 + ... + 11990.

It is an arithmetic number, because the mean of its divisors is an integer number (1316736).

Almost surely, 2^13138665 is an apocalyptic number.

13138665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13138665 is a deficient number, since it is larger than the sum of its proper divisors (7929111).

13138665 is a wasteful number, since it uses less digits than its factorization.

13138665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920.

The product of its digits is 12960, while the sum is 33.

The square root of 13138665 is about 3624.7296450908. The cubic root of 13138665 is about 235.9665338450.

The spelling of 13138665 in words is "thirteen million, one hundred thirty-eight thousand, six hundred sixty-five".