138818085 has 64 divisors (see below), whose sum is σ = 269568000. Its totient is φ = 59588352.

The previous prime is 138818083. The next prime is 138818101. The reversal of 138818085 is 580818831.

It is not a de Polignac number, because 138818085 - 2¹ = 138818083 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138818083) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 297022 + ... + 297488.

It is an arithmetic number, because the mean of its divisors is an integer number (4212000).

Almost surely, 2^138818085 is an apocalyptic number.

138818085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138818085 is a deficient number, since it is larger than the sum of its proper divisors (130749915).

138818085 is a wasteful number, since it uses less digits than its factorization.

138818085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650.

The product of its (nonzero) digits is 61440, while the sum is 42.

The square root of 138818085 is about 11782.1086822351. The cubic root of 138818085 is about 517.7840677093.

The spelling of 138818085 in words is "one hundred thirty-eight million, eight hundred eighteen thousand, eighty-five".