138155193 has 16 divisors (see below), whose sum is σ = 223281600. Its totient is φ = 83730240.

The previous prime is 138155177. The next prime is 138155203. The reversal of 138155193 is 391551831.

138155193 is a `hidden beast` number, since 13 + 8 + 1 + 551 + 93 = 666.

It is not a de Polignac number, because 138155193 - 2⁴ = 138155177 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (138155113) 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, 232288 + ... + 232881.

It is an arithmetic number, because the mean of its divisors is an integer number (13955100).

Almost surely, 2^138155193 is an apocalyptic number.

It is an amenable number.

138155193 is a deficient number, since it is larger than the sum of its proper divisors (85126407).

138155193 is a wasteful number, since it uses less digits than its factorization.

138155193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465189 (or 465183 counting only the distinct ones).

The product of its digits is 16200, while the sum is 36.

The square root of 138155193 is about 11753.9437211516. The cubic root of 138155193 is about 516.9585683632.

The spelling of 138155193 in words is "one hundred thirty-eight million, one hundred fifty-five thousand, one hundred ninety-three".