138181587 has 4 divisors (see below), whose sum is σ = 184242120. Its totient is φ = 92121056.

The previous prime is 138181573. The next prime is 138181609. The reversal of 138181587 is 785181831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138181587 - 2⁸ = 138181331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138181567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23030262 + ... + 23030267.

It is an arithmetic number, because the mean of its divisors is an integer number (46060530).

Almost surely, 2^138181587 is an apocalyptic number.

138181587 is a deficient number, since it is larger than the sum of its proper divisors (46060533).

138181587 is an equidigital number, since it uses as much as digits as its factorization.

138181587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46060532.

The product of its digits is 53760, while the sum is 42.

The square root of 138181587 is about 11755.0664396251. The cubic root of 138181587 is about 516.9914872262.

The spelling of 138181587 in words is "one hundred thirty-eight million, one hundred eighty-one thousand, five hundred eighty-seven".