138285109 has 8 divisors (see below), whose sum is σ = 143207352. Its totient is φ = 133448640.

The previous prime is 138285107. The next prime is 138285113. The reversal of 138285109 is 901582831.

It can be written as a sum of positive squares in 4 ways, for example, as 152100 + 138133009 = 390^2 + 11753^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 138285109 - 2¹ = 138285107 is a prime.

It is a super-2 number, since 2×138285109² = 38245542742283762, 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 (138285107) 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 7 ways as a sum of consecutive naturals, for example, 18154 + ... + 24619.

It is an arithmetic number, because the mean of its divisors is an integer number (17900919).

Almost surely, 2^138285109 is an apocalyptic number.

It is an amenable number.

138285109 is a deficient number, since it is larger than the sum of its proper divisors (4922243).

138285109 is an equidigital number, since it uses as much as digits as its factorization.

138285109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42887.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 138285109 is about 11759.4689080757. The cubic root of 138285109 is about 517.1205604604.

The spelling of 138285109 in words is "one hundred thirty-eight million, two hundred eighty-five thousand, one hundred nine".