138335913 has 12 divisors (see below), whose sum is σ = 201687408. Its totient is φ = 91361400.

The previous prime is 138335909. The next prime is 138335929. The reversal of 138335913 is 319533831.

It is a happy number.

138335913 is a `hidden beast` number, since 1 + 38 + 33 + 591 + 3 = 666.

It is not a de Polignac number, because 138335913 - 2² = 138335909 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138335213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70863 + ... + 72788.

It is an arithmetic number, because the mean of its divisors is an integer number (16807284).

Almost surely, 2^138335913 is an apocalyptic number.

It is an amenable number.

138335913 is a deficient number, since it is larger than the sum of its proper divisors (63351495).

138335913 is a wasteful number, since it uses less digits than its factorization.

138335913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143764 (or 143761 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 138335913 is about 11761.6288412787. The cubic root of 138335913 is about 517.1838803086.

The spelling of 138335913 in words is "one hundred thirty-eight million, three hundred thirty-five thousand, nine hundred thirteen".