138547087 has 4 divisors (see below), whose sum is σ = 158339536. Its totient is φ = 118754640.

The previous prime is 138547063. The next prime is 138547111. The reversal of 138547087 is 780745831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 780745831 = 4483 ⋅174157.

It is an interprime number because it is at equal distance from previous prime (138547063) and next prime (138547111).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138547087 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 (138557087) 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, 9896214 + ... + 9896227.

It is an arithmetic number, because the mean of its divisors is an integer number (39584884).

Almost surely, 2^138547087 is an apocalyptic number.

138547087 is a deficient number, since it is larger than the sum of its proper divisors (19792449).

138547087 is an equidigital number, since it uses as much as digits as its factorization.

138547087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19792448.

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 138547087 is about 11770.6026608666. The cubic root of 138547087 is about 517.4469121796.

The spelling of 138547087 in words is "one hundred thirty-eight million, five hundred forty-seven thousand, eighty-seven".