138217587 has 8 divisors (see below), whose sum is σ = 187767504. Its totient is φ = 90406368.

The previous prime is 138217579. The next prime is 138217613. The reversal of 138217587 is 785712831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138217587 - 2³ = 138217579 is a prime.

It is a super-2 number, since 2×138217587² = 38208202712205138, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138217577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 434488 + ... + 434805.

It is an arithmetic number, because the mean of its divisors is an integer number (23470938).

Almost surely, 2^138217587 is an apocalyptic number.

138217587 is a deficient number, since it is larger than the sum of its proper divisors (49549917).

138217587 is an equidigital number, since it uses as much as digits as its factorization.

138217587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869349.

The product of its digits is 94080, while the sum is 42.

The square root of 138217587 is about 11756.5975945424. The cubic root of 138217587 is about 517.0363800321.

The spelling of 138217587 in words is "one hundred thirty-eight million, two hundred seventeen thousand, five hundred eighty-seven".