138550087 has 6 divisors (see below), whose sum is σ = 150027792. Its totient is φ = 127892232.

The previous prime is 138550019. The next prime is 138550103. The reversal of 138550087 is 780055831.

It is not a de Polignac number, because 138550087 - 2⁷ = 138549959 is a prime.

It is a super-2 number, since 2×138550087² = 38392253215415138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138550007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 409743 + ... + 410080.

It is an arithmetic number, because the mean of its divisors is an integer number (25004632).

Almost surely, 2^138550087 is an apocalyptic number.

138550087 is a deficient number, since it is larger than the sum of its proper divisors (11477705).

138550087 is an equidigital number, since it uses as much as digits as its factorization.

138550087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819849 (or 819836 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 138550087 is about 11770.7300963024. The cubic root of 138550087 is about 517.4506469617.

The spelling of 138550087 in words is "one hundred thirty-eight million, five hundred fifty thousand, eighty-seven".