138081285 has 48 divisors (see below), whose sum is σ = 249719808. Its totient is φ = 70575840.

The previous prime is 138081277. The next prime is 138081287. The reversal of 138081285 is 582180831.

It is not a de Polignac number, because 138081285 - 2³ = 138081277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138081287) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1340544 + ... + 1340646.

It is an arithmetic number, because the mean of its divisors is an integer number (5202496).

Almost surely, 2^138081285 is an apocalyptic number.

138081285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138081285 is a deficient number, since it is larger than the sum of its proper divisors (111638523).

138081285 is an equidigital number, since it uses as much as digits as its factorization.

138081285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 138081285 is about 11750.7993345134. The cubic root of 138081285 is about 516.8663672468.

The spelling of 138081285 in words is "one hundred thirty-eight million, eighty-one thousand, two hundred eighty-five".