138395087 has 4 divisors (see below), whose sum is σ = 138430656. Its totient is φ = 138359520.

The previous prime is 138395083. The next prime is 138395099. The reversal of 138395087 is 780593831.

It is a happy number.

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 138395087 - 2² = 138395083 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138395083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11114 + ... + 20007.

It is an arithmetic number, because the mean of its divisors is an integer number (34607664).

Almost surely, 2^138395087 is an apocalyptic number.

138395087 is a deficient number, since it is larger than the sum of its proper divisors (35569).

138395087 is an equidigital number, since it uses as much as digits as its factorization.

138395087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35568.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 138395087 is about 11764.1441252647. The cubic root of 138395087 is about 517.2576126115.

The spelling of 138395087 in words is "one hundred thirty-eight million, three hundred ninety-five thousand, eighty-seven".