138706587 has 24 divisors (see below), whose sum is σ = 220003056. Its totient is φ = 87028992.

The previous prime is 138706577. The next prime is 138706597. The reversal of 138706587 is 785607831.

138706587 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (138706577) and next prime (138706597).

It is not a de Polignac number, because 138706587 - 2¹² = 138702491 is a prime.

It is a super-3 number, since 3×138706587³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (138706577) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12658 + ... + 20919.

It is an arithmetic number, because the mean of its divisors is an integer number (9166794).

Almost surely, 2^138706587 is an apocalyptic number.

138706587 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

138706587 is a deficient number, since it is larger than the sum of its proper divisors (81296469).

138706587 is an equidigital number, since it uses as much as digits as its factorization.

138706587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33609 (or 33597 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The square root of 138706587 is about 11777.3760660004. The cubic root of 138706587 is about 517.6454033762.

The spelling of 138706587 in words is "one hundred thirty-eight million, seven hundred six thousand, five hundred eighty-seven".