138148665 has 16 divisors (see below), whose sum is σ = 221201088. Its totient is φ = 73624896.

The previous prime is 138148607. The next prime is 138148667. The reversal of 138148665 is 566841831.

It is not a de Polignac number, because 138148665 - 2⁷ = 138148537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138148667) 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 15 ways as a sum of consecutive naturals, for example, 25539 + ... + 30471.

It is an arithmetic number, because the mean of its divisors is an integer number (13825068).

Almost surely, 2^138148665 is an apocalyptic number.

138148665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138148665 is a deficient number, since it is larger than the sum of its proper divisors (83052423).

138148665 is a wasteful number, since it uses less digits than its factorization.

138148665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6808.

The product of its digits is 138240, while the sum is 42.

The square root of 138148665 is about 11753.6660238412. Note that the first 3 decimals coincide. The cubic root of 138148665 is about 516.9504259290.

The spelling of 138148665 in words is "one hundred thirty-eight million, one hundred forty-eight thousand, six hundred sixty-five".