138835187 has 4 divisors (see below), whose sum is σ = 138865920. Its totient is φ = 138804456.

The previous prime is 138835183. The next prime is 138835217. The reversal of 138835187 is 781538831.

138835187 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 138835187 - 2² = 138835183 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138835183) 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, 7112 + ... + 18117.

It is an arithmetic number, because the mean of its divisors is an integer number (34716480).

Almost surely, 2^138835187 is an apocalyptic number.

138835187 is a deficient number, since it is larger than the sum of its proper divisors (30733).

138835187 is an equidigital number, since it uses as much as digits as its factorization.

138835187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30732.

The product of its digits is 161280, while the sum is 44.

The square root of 138835187 is about 11782.8344213097. The cubic root of 138835187 is about 517.8053300194.

The spelling of 138835187 in words is "one hundred thirty-eight million, eight hundred thirty-five thousand, one hundred eighty-seven".