138133387 has 8 divisors (see below), whose sum is σ = 161717472. Its totient is φ = 115512000.

The previous prime is 138133367. The next prime is 138133393. The reversal of 138133387 is 783331831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138133387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138133327) 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 7 ways as a sum of consecutive naturals, for example, 240364 + ... + 240937.

It is an arithmetic number, because the mean of its divisors is an integer number (20214684).

Almost surely, 2^138133387 is an apocalyptic number.

138133387 is a deficient number, since it is larger than the sum of its proper divisors (23584085).

138133387 is an equidigital number, since it uses as much as digits as its factorization.

138133387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481349.

The product of its digits is 36288, while the sum is 37.

The square root of 138133387 is about 11753.0160809896. The cubic root of 138133387 is about 516.9313685370.

The spelling of 138133387 in words is "one hundred thirty-eight million, one hundred thirty-three thousand, three hundred eighty-seven".