138225285 has 160 divisors (see below), whose sum is σ = 301086720. Its totient is φ = 59875200.

The previous prime is 138225271. The next prime is 138225287. The reversal of 138225285 is 582522831.

It is not a de Polignac number, because 138225285 - 2⁵ = 138225253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138225287) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 1946800 + ... + 1946870.

It is an arithmetic number, because the mean of its divisors is an integer number (1881792).

Almost surely, 2^138225285 is an apocalyptic number.

138225285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138225285 is an abundant number, since it is smaller than the sum of its proper divisors (162861435).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138225285 is a wasteful number, since it uses less digits than its factorization.

138225285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 132 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 138225285 is about 11756.9249806231. The cubic root of 138225285 is about 517.0459785987.

The spelling of 138225285 in words is "one hundred thirty-eight million, two hundred twenty-five thousand, two hundred eighty-five".